VANGUARD INDEX TRUST
NSAR-B, 1999-02-18
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<PAGE>      PAGE  1
000 B000000 12/31/98
000 C000000 0000036405
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 U
001 A000000 VANGUARD INDEX FUNDS
001 B000000 811-2652
001 C000000 6106691000
002 A000000 100 VANGUARD BOULEVARD
002 B000000 MALVERN
002 C000000 PA
002 D010000 19355
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  9
007 C010100  1
007 C020100 VANGUARD 500 INDEX FUND
007 C030100 N
007 C010200  2
007 C020200 VANGUARD EXTENDED MARKET INDEX FUND
007 C030200 N
007 C010300  3
007 C020300 VANGUARD TOTAL STOCK MARKET INDEX FUND
007 C030300 N
007 C010400  4
007 C020400 VANGUARD VALUE INDEX FUND
007 C030400 N
007 C010500  5
007 C020500 VANGUARD GROWTH INDEX FUND
007 C030500 N
007 C010600  6
007 C020600 VANGUARD SMALL-CAP INDEX FUND
007 C030600 N
007 C010700  7
007 C020700 VANGUARD MID-CAP INDEX FUND
007 C030700 N
007 C010800  8
007 C020800 VANGUARD SMALL-CAP VALUE INDEX FUND
007 C030800 N
007 C010900  9
007 C020900 VANGUARD SMALL-CAP GROWTH INDEX FUND
007 C030900 N
007 C011000 10
010 A00AA01 THE VANGUARD GROUP, INC.
<PAGE>      PAGE  2
010 B00AA01 801-11953
010 C01AA01 MALVERN
010 C02AA01 PA
010 C03AA01 19355
012 A00AA01 THE VANGUARD GROUP, INC.
012 B00AA01 84-772
012 C01AA01 MALVERN
012 C02AA01 PA
012 C03AA01 19355
013 A00AA01 PRICE WATERHOUSE LLP
013 B01AA01 PHILADELPHIA
013 B02AA01 PA
013 B03AA01 19103
014 A00AA01 VANGUARD MARKETING CORPORATION
014 B00AA01 8-21570
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   97
019 C00AA00 VANGUARDGR
020 A000001 INVESTMENT TECHNOLOGY GROUP, INC.
020 B000001 95-4339369
020 C000001   2053
020 A000002 BEAR STEARNS & COS. INC.
020 B000002 13-3299429
020 C000002   1489
020 A000003 SMITH BARNEY INC.
020 B000003 13-1912900
020 C000003   1176
020 A000004 INSTINET CORP.
020 B000004 13-3443395
020 C000004   1128
020 A000005 PAINEWEBBER INC.
020 B000005 13-2638166
020 C000005    899
020 A000006 MORGAN STANLEY & CO., INC.
020 B000006 13-2655998
020 C000006    597
020 A000007 GOLDMAN SACHS & CO.
020 B000007 13-5108880
020 C000007    352
020 A000008 WEEDEN & CO.
020 B000008 13-3364318
020 C000008    270
020 A000009 SBC WARBURG INC.
020 B000009 13-3340045
020 C000009    221
020 A000010 CREDIT SUISSE FIRST BOSTON CORP.
020 B000010 13-5659485
020 C000010    217
021  000000     9244
022 A000001 THE VANGUARD GROUP, INC./POOLED CASH ACCT.
<PAGE>      PAGE  3
022 B000001 23-1945930
022 C000001   7922561
022 D000001   8076737
022 A000002 TROSTER SINGER STEVENS ROTHCHILD CORP.
022 B000002 13-5515160
022 C000002   1618823
022 D000002     25115
022 A000003 VANGUARD VALUE INDEX FUND
022 B000003 23-2695173
022 C000003    416034
022 D000003    578837
022 A000004 VANGUARD GROWTH INDEX FUND
022 B000004 23-2695174
022 C000004    571540
022 D000004    355312
022 A000005 VANGUARD INSTITUTIONAL INDEX FUND
022 B000005 23-2601141
022 C000005    450101
022 D000005    172729
022 A000006 MORGAN STANLEY & CO., INC.
022 B000006 13-2655998
022 C000006    537934
022 D000006      2795
022 A000007 GOLDMAN SACHS & CO.
022 B000007 13-5108880
022 C000007    501612
022 D000007      6314
022 A000008 VANGUARD 500 INDEX FUND
022 B000008 23-1999755
022 C000008     26596
022 D000008    344628
022 A000009 VANGUARD EXTENDED MARKET INDEX FUND
022 B000009 23-2482430
022 C000009    258103
022 D000009     28468
022 A000010 SHERWOOD SECURITIES CORP.
022 B000010 13-2616318
022 C000010    101757
022 D000010     76677
023 C000000   13323158
023 D000000   10415845
026 A000000 N
026 B000000 N
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 Y
<PAGE>      PAGE  4
029  00AA00 N
030 A00AA00      0
030 B00AA00  0.00
030 C00AA00  0.00
031 A00AA00      0
031 B00AA00      0
032  00AA00      0
033  00AA00      0
034  00AA00 N
035  00AA00      0
036 B00AA00      0
037  00AA00 N
038  00AA00      0
039  00AA00 Y
040  00AA00 N
042 A00AA00   0
042 B00AA00   0
042 C00AA00   0
042 D00AA00   0
042 E00AA00   0
042 F00AA00   0
042 G00AA00   0
042 H00AA00   0
043  00AA00      0
044  00AA00      0
045  00AA00 N
048  00AA00  0.000
048 A01AA00        0
048 A02AA00 0.000
048 B01AA00        0
048 B02AA00 0.000
048 C01AA00        0
048 C02AA00 0.000
048 D01AA00        0
048 D02AA00 0.000
048 E01AA00        0
048 E02AA00 0.000
048 F01AA00        0
048 F02AA00 0.000
048 G01AA00        0
048 G02AA00 0.000
048 H01AA00        0
048 H02AA00 0.000
048 I01AA00        0
048 I02AA00 0.000
048 J01AA00        0
048 J02AA00 0.000
048 K01AA00        0
048 K02AA00 0.000
058 A00AA00 N
059  00AA00 Y
<PAGE>      PAGE  5
060 A00AA00 Y
060 B00AA00 Y
061  00AA00     3000
062 A00AA00 N
062 B00AA00   0.0
062 C00AA00   0.0
062 D00AA00   0.0
062 E00AA00   0.0
062 F00AA00   0.0
062 G00AA00   0.0
062 H00AA00   0.0
062 I00AA00   0.0
062 J00AA00   0.0
062 K00AA00   0.0
062 L00AA00   0.0
062 M00AA00   0.0
062 N00AA00   0.0
062 O00AA00   0.0
062 P00AA00   0.0
062 Q00AA00   0.0
062 R00AA00   0.0
063 A00AA00   0
063 B00AA00  0.0
077 A000000 Y
077 B000000 Y
077 C000000 Y
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N
078  000000 N
080 A00AA00 ICI MUTUAL INSURANCE COMPANY
080 C00AA00   350000
081 A00AA00 Y
081 B00AA00 174
082 A00AA00 N
082 B00AA00        0
083 A00AA00 N
083 B00AA00        0
<PAGE>      PAGE  6
084 A00AA00 N
084 B00AA00        0
085 A00AA00 Y
085 B00AA00 N
086 A010000      0
086 A020000      0
086 B010000      0
086 B020000      0
086 C010000      0
086 C020000      0
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
015 A000101 STATE STREET BANK AND TRUST COMPANY
015 B000101 C
015 C010101 BOSTON
015 C020101 MA
015 C030101 02110
015 E010101 X
024  000100 Y
025 A000101 MORGAN STANLEY DEAN WITTER & CO.
025 B000101 13-2655998
025 C000101 E
025 D000101  304267
025 A000102 BEAR STEARNS & CO. INC.
025 B000102 13-3299429
025 C000102 E
025 D000102   31339
025 D000103       0
025 D000104       0
025 D000105       0
025 D000106       0
025 D000107       0
025 D000108       0
028 A010100   1960690
028 A020100         0
028 A030100         0
028 A040100    827393
028 B010100   1618430
028 B020100         0
028 B030100         0
028 B040100   1347798
028 C010100   1635932
028 C020100    154947
028 C030100         0
028 C040100    983587
028 D010100   1281154
028 D020100         0
<PAGE>      PAGE  7
028 D030100         0
028 D040100   1171220
028 E010100   1644051
028 E020100         0
028 E030100         0
028 E040100    771042
028 F010100   1994292
028 F020100    487728
028 F030100         0
028 F040100   1315570
028 G010100  10134549
028 G020100    642675
028 G030100         0
028 G040100   6416610
028 H000100         0
070 A010100 Y
070 A020100 Y
070 B010100 Y
070 B020100 N
070 C010100 N
070 C020100 N
070 D010100 Y
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 Y
070 F020100 Y
070 G010100 Y
070 G020100 N
070 H010100 Y
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 Y
070 K020100 N
070 L010100 Y
070 L020100 Y
070 M010100 N
070 M020100 N
070 N010100 Y
070 N020100 Y
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 Y
070 Q010100 N
070 Q020100 N
070 R010100 N
070 R020100 N
<PAGE>      PAGE  8
071 A000100  14014047
071 B000100   3349516
071 C000100  60203682
071 D000100    6
072 A000100 12
072 B000100    32484
072 C000100   898388
072 D000100        0
072 E000100      995
072 F000100       80
072 G000100    45823
072 H000100        0
072 I000100    47105
072 J000100      151
072 K000100        0
072 L000100     1608
072 M000100      105
072 N000100        0
072 O000100        0
072 P000100        0
072 Q000100        0
072 R000100       45
072 S000100        0
072 T000100    15206
072 U000100        0
072 V000100      180
072 W000100        0
072 X000100   110303
072 Y000100        0
072 Z000100   821564
072AA000100  1648106
072BB000100   128895
072CC010100 13039461
072CC020100        0
072DD010100   822586
072DD020100        0
072EE000100   262081
073 A010100   1.3300
073 A020100   0.0000
073 B000100   0.4200
073 C000100   0.0000
074 A000100       38
074 B000100   469814
074 C000100    38243
074 D000100        0
074 E000100        0
074 F000100 73813849
074 G000100        0
074 H000100        0
074 I000100    12451
074 J000100   382158
<PAGE>      PAGE  9
074 K000100        0
074 L000100   442451
074 M000100        0
074 N000100 75159004
074 O000100   697610
074 P000100    16854
074 Q000100        0
074 R010100        0
074 R020100        0
074 R030100        0
074 R040100   216014
074 S000100        0
074 T000100 74228526
074 U010100   651398
074 U020100        0
074 V010100   113.95
074 V020100     0.00
074 W000100   0.0000
074 X000100  1883829
074 Y000100    38243
075 A000100        0
075 B000100 60729871
076  000100     0.00
015 A000201 STATE STREET BANK AND TRUST COMPANY
015 B000201 C
015 C010201 BOSTON
015 C020201 MA
015 C030201 02110
015 E010201 X
024  000200 Y
025 A000201 PAINEWEBBER INC.
025 B000201 13-2638166
025 C000201 E
025 D000201    6528
025 A000202 INVESTMENT TECHNOLOGY GROUP, INC.
025 B000202 95-4339369
025 C000202 E
025 D000202    2116
025 A000203 DELETE
025 D000203       0
025 D000204       0
025 D000205       0
025 D000206       0
025 D000207       0
025 D000208       0
028 A010200    127791
028 A020200         0
028 A030200         0
028 A040200    122248
028 B010200     51821
028 B020200         0
<PAGE>      PAGE  10
028 B030200         0
028 B040200     71695
028 C010200     55487
028 C020200         0
028 C030200         0
028 C040200     51830
028 D010200     43770
028 D020200         0
028 D030200         0
028 D040200     53431
028 E010200     71193
028 E020200         0
028 E030200         0
028 E040200     37321
028 F010200     66274
028 F020200    207116
028 F030200         0
028 F040200    105428
028 G010200    416336
028 G020200    207116
028 G030200         0
028 G040200    441953
028 H000200         0
055 A000200 N
055 B000200 N
056  000200 N
057  000200 N
066 A000200 Y
066 B000200 N
066 C000200 N
066 D000200 Y
066 E000200 N
066 F000200 N
066 G000200 N
067  000200 N
068 A000200 N
068 B000200 N
069  000200 Y
070 A010200 Y
070 A020200 Y
070 B010200 Y
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 Y
070 D020200 N
070 E010200 N
070 E020200 N
070 F010200 Y
070 F020200 Y
070 G010200 Y
<PAGE>      PAGE  11
070 G020200 N
070 H010200 Y
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 Y
070 K010200 Y
070 K020200 N
070 L010200 Y
070 L020200 Y
070 M010200 N
070 M020200 N
070 N010200 Y
070 N020200 Y
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 Y
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200    923733
071 B000200    860026
071 C000200   3150696
071 D000200   27
072 A000200 12
072 B000200     4750
072 C000200    37381
072 D000200        0
072 E000200     4539
072 F000200       73
072 G000200     2265
072 H000200        0
072 I000200     3446
072 J000200      175
072 K000200        0
072 L000200       88
072 M000200        6
072 N000200        0
072 O000200        0
072 P000200        0
072 Q000200        0
072 R000200       10
072 S000200        0
072 T000200      823
072 U000200        0
072 V000200       11
072 W000200        0
072 X000200     6897
<PAGE>      PAGE  12
072 Y000200       34
072 Z000200    39807
072AA000200   454075
072BB000200    86993
072CC010200        0
072CC020200   154493
072DD010200    33806
072DD020200     5556
072EE000200   225920
073 A010200   0.3730
073 A020200   0.4120
073 B000200   2.1700
073 C000200   0.0000
074 A000200        0
074 B000200   330413
074 C000200     2495
074 D000200        0
074 E000200        0
074 F000200  3316354
074 G000200        0
074 H000200        0
074 I000200      574
074 J000200   143690
074 K000200        0
074 L000200    18447
074 M000200        0
074 N000200  3811973
074 O000200    83155
074 P000200     1053
074 Q000200        0
074 R010200        0
074 R020200        0
074 R030200        0
074 R040200   332606
074 S000200        0
074 T000200  3395159
074 U010200    95929
074 U020200    14901
074 V010200    30.63
074 V020200    30.63
074 W000200   0.0000
074 X000200   106164
074 Y000200     2495
075 A000200        0
075 B000200  3238180
076  000200     0.00
015 A000301 STATE STREET BANK AND TRUST COMPANY
015 B000301 C
015 C010301 BOSTON
015 C020301 MA
015 C030301 02110
<PAGE>      PAGE  13
015 E010301 X
024  000300 Y
025 A000301 MORGAN STANLEY DEAN WITTER & CO.
025 B000301 13-2655998
025 C000301 E
025 D000301   37651
025 A000302 PAINEWEBBER INCORPORATED
025 B000302 13-2638166
025 C000302 E
025 D000302    4830
025 A000303 BEAR STEARNS CO., INC.
025 B000303 13-3299429
025 C000303 E
025 D000303    3796
025 A000304 DELETE
025 D000304       0
025 D000305       0
025 D000306       0
025 D000307       0
025 D000308       0
028 A010300    402180
028 A020300         0
028 A030300         0
028 A040300    175428
028 B010300    617580
028 B020300         0
028 B030300         0
028 B040300    134525
028 C010300    435243
028 C020300     22131
028 C030300         0
028 C040300    147822
028 D010300    412903
028 D020300         0
028 D030300         0
028 D040300    144989
028 E010300    304586
028 E020300         0
028 E030300         0
028 E040300    131401
028 F010300    392936
028 F020300     90418
028 F030300         0
028 F040300    132582
028 G010300   2565428
028 G020300    112549
028 G030300         0
028 G040300    866747
028 H000300         0
070 A010300 Y
070 A020300 Y
<PAGE>      PAGE  14
070 B010300 Y
070 B020300 N
070 C010300 N
070 C020300 N
070 D010300 Y
070 D020300 N
070 E010300 N
070 E020300 N
070 F010300 Y
070 F020300 Y
070 G010300 Y
070 G020300 N
070 H010300 Y
070 H020300 N
070 I010300 N
070 I020300 N
070 J010300 Y
070 J020300 Y
070 K010300 Y
070 K020300 N
070 L010300 Y
070 L020300 Y
070 M010300 N
070 M020300 N
070 N010300 Y
070 N020300 Y
070 O010300 Y
070 O020300 N
070 P010300 Y
070 P020300 Y
070 Q010300 N
070 Q020300 N
070 R010300 N
070 R020300 N
071 A000300   3535598
071 B000300    213399
071 C000300   8438357
071 D000300    3
072 A000300 12
072 B000300    23390
072 C000300   118554
072 D000300        0
072 E000300     3182
072 F000300       82
072 G000300     5836
072 H000300        0
072 I000300     7294
072 J000300      292
072 K000300        0
072 L000300      108
072 M000300       15
<PAGE>      PAGE  15
072 N000300        0
072 O000300        0
072 P000300        0
072 Q000300        0
072 R000300       13
072 S000300        0
072 T000300     2200
072 U000300        0
072 V000300       17
072 W000300        0
072 X000300    15857
072 Y000300       37
072 Z000300   129306
072AA000300   165060
072BB000300    87865
072CC010300  1758376
072CC020300        0
072DD010300   100035
072DD020300    28557
072EE000300    48109
073 A010300   0.3290
073 A020300   0.3520
073 B000300   0.1250
073 C000300   0.0000
074 A000300        0
074 B000300   722165
074 C000300    21979
074 D000300        0
074 E000300        0
074 F000300 11210503
074 G000300        0
074 H000300        0
074 I000300     1925
074 J000300    44915
074 K000300        0
074 L000300    41000
074 M000300        0
074 N000300 12042487
074 O000300     1572
074 P000300     2227
074 Q000300        0
074 R010300        0
074 R020300        0
074 R030300        0
074 R040300   285569
074 S000300        0
074 T000300 11753119
074 U010300   339456
074 U020300    89179
074 V010300    27.42
074 V020300    27.42
<PAGE>      PAGE  16
074 W000300   0.0000
074 X000300   224355
074 Y000300    21979
075 A000300        0
075 B000300  8849541
076  000300     0.00
015 A000401 FIRST UNION NATIONAL BANK
015 B000401 C
015 C010401 PHILADELPHIA
015 C020401 PA
015 C030401 19101
015 E010401 X
024  000400 Y
025 A000401 MORGAN STANLEY DEAN WITTER & CO.
025 B000401 13-2655998
025 C000401 E
025 D000401   23267
025 A000402 BEAR STEARNS & CO., INC.
025 B000402 13-3299429
025 C000402 E
025 D000402    2426
025 D000403       0
025 D000404       0
025 D000405       0
025 D000406       0
025 D000407       0
025 D000408       0
028 A010400    101740
028 A020400         0
028 A030400         0
028 A040400     50801
028 B010400     75711
028 B020400         0
028 B030400         0
028 B040400     53170
028 C010400     52449
028 C020400      6441
028 C030400         0
028 C040400     40225
028 D010400    172545
028 D020400         2
028 D030400         0
028 D040400     72509
028 E010400     60190
028 E020400         0
028 E030400         0
028 E040400     44264
028 F010400    104904
028 F020400     77844
028 F030400         0
028 F040400     49475
<PAGE>      PAGE  17
028 G010400    567539
028 G020400     84287
028 G030400         0
028 G040400    310444
028 H000400         0
066 A000400 Y
066 B000400 N
066 C000400 N
066 D000400 N
066 E000400 Y
066 F000400 N
066 G000400 N
067  000400 N
068 A000400 N
068 B000400 N
069  000400 Y
070 A010400 Y
070 A020400 Y
070 B010400 Y
070 B020400 N
070 C010400 N
070 C020400 N
070 D010400 Y
070 D020400 N
070 E010400 N
070 E020400 N
070 F010400 Y
070 F020400 Y
070 G010400 Y
070 G020400 N
070 H010400 Y
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 N
070 K010400 Y
070 K020400 N
070 L010400 Y
070 L020400 Y
070 M010400 N
070 M020400 N
070 N010400 Y
070 N020400 Y
070 O010400 Y
070 O020400 N
070 P010400 Y
070 P020400 Y
070 Q010400 N
070 Q020400 N
070 R010400 N
<PAGE>      PAGE  18
070 R020400 N
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071 C000400   2163522
071 D000400   33
072 A000400 12
072 B000400      398
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<PAGE>      PAGE  19
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<PAGE>      PAGE  20
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<PAGE>      PAGE  21
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<PAGE>      PAGE  22
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<PAGE>      PAGE  23
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<PAGE>      PAGE  24
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<PAGE>      PAGE  25
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<PAGE>      PAGE  26
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<PAGE>      PAGE  27
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<PAGE>      PAGE  28
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<PAGE>      PAGE  29
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<PAGE>      PAGE  30
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<PAGE>      PAGE  31
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<PAGE>      PAGE  32
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<PAGE>      PAGE  33
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<PAGE>      PAGE  34
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SIGNATURE   GARY P. SOURA                                
TITLE       MANAGER             
 


<TABLE> <S> <C>

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<NAME> VANGUARD INDEX FUNDS
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<OVERDISTRIB-NII-PRIOR>                           5129
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               80
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 110303
<AVERAGE-NET-ASSETS>                          60729871
<PER-SHARE-NAV-BEGIN>                            90.07
<PER-SHARE-NII>                                   1.33
<PER-SHARE-GAIN-APPREC>                          24.30
<PER-SHARE-DIVIDEND>                              1.33
<PER-SHARE-DISTRIBUTIONS>                         0.42
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                             113.95
<EXPENSE-RATIO>                                   0.18
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 021
   <NAME> VANGUARD EXTENDED MARKET INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          2891395
<INVESTMENTS-AT-VALUE>                         3649262
<RECEIVABLES>                                   162137
<ASSETS-OTHER>                                     574
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 3811973
<PAYABLE-FOR-SECURITIES>                         83155
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       333659
<TOTAL-LIABILITIES>                             416814
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2458296
<SHARES-COMMON-STOCK>                            95929
<SHARES-COMMON-PRIOR>                            88529
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                             133
<ACCUMULATED-NET-GAINS>                         176135
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        760861
<NET-ASSETS>                                   2938675
<DIVIDEND-INCOME>                                37381
<INTEREST-INCOME>                                 4750
<OTHER-INCOME>                                    4539
<EXPENSES-NET>                                    6863
<NET-INVESTMENT-INCOME>                          39807
<REALIZED-GAINS-CURRENT>                        367082
<APPREC-INCREASE-CURRENT>                     (154493)
<NET-CHANGE-FROM-OPS>                           252396
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        33806
<DISTRIBUTIONS-OF-GAINS>                        195606
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          21213
<NUMBER-OF-SHARES-REDEEMED>                      21009
<SHARES-REINVESTED>                               7196
<NET-CHANGE-IN-ASSETS>                          257680
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        34973
<OVERDISTRIB-NII-PRIOR>                            578
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               73
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   6897
<AVERAGE-NET-ASSETS>                           2782988
<PER-SHARE-NAV-BEGIN>                            30.76
<PER-SHARE-NII>                                  0.388
<PER-SHARE-GAIN-APPREC>                          2.025
<PER-SHARE-DIVIDEND>                             0.373
<PER-SHARE-DISTRIBUTIONS>                        2.170
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              30.63
<EXPENSE-RATIO>                                   0.23
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 022
   <NAME> VANGUARD EXTENDED MARKET INDEX FUND-INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          2891395
<INVESTMENTS-AT-VALUE>                         3649262
<RECEIVABLES>                                   162137
<ASSETS-OTHER>                                     574
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 3811973
<PAYABLE-FOR-SECURITIES>                         83155
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       333659
<TOTAL-LIABILITIES>                             416814
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2458296
<SHARES-COMMON-STOCK>                            14901
<SHARES-COMMON-PRIOR>                            13482
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                             133
<ACCUMULATED-NET-GAINS>                         176135
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        760861
<NET-ASSETS>                                    456484
<DIVIDEND-INCOME>                                37381
<INTEREST-INCOME>                                 4750
<OTHER-INCOME>                                    4539
<EXPENSES-NET>                                    6863
<NET-INVESTMENT-INCOME>                          39807
<REALIZED-GAINS-CURRENT>                        367082
<APPREC-INCREASE-CURRENT>                     (154493)
<NET-CHANGE-FROM-OPS>                           252396
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         5556
<DISTRIBUTIONS-OF-GAINS>                         30314
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           7627
<NUMBER-OF-SHARES-REDEEMED>                       7244
<SHARES-REINVESTED>                               1037
<NET-CHANGE-IN-ASSETS>                          257680
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        34973
<OVERDISTRIB-NII-PRIOR>                            578
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               73
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   6897
<AVERAGE-NET-ASSETS>                            455192
<PER-SHARE-NAV-BEGIN>                            30.76
<PER-SHARE-NII>                                  0.427
<PER-SHARE-GAIN-APPREC>                          2.025
<PER-SHARE-DIVIDEND>                             0.412
<PER-SHARE-DISTRIBUTIONS>                        2.170
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              30.63
<EXPENSE-RATIO>                                   0.10
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED> 
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 031
   <NAME> VANGUARD TOTAL STOCK MARKET INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1,000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          8365070
<INVESTMENTS-AT-VALUE>                        11954647
<RECEIVABLES>                                    85915
<ASSETS-OTHER>                                    1925
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                12042487
<PAYABLE-FOR-SECURITIES>                          1572
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       287796
<TOTAL-LIABILITIES>                             289368
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       8092915
<SHARES-COMMON-STOCK>                           339456
<SHARES-COMMON-PRIOR>                           224899
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                             242
<ACCUMULATED-NET-GAINS>                          41321
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       3619125
<NET-ASSETS>                                   9307762
<DIVIDEND-INCOME>                               118554
<INTEREST-INCOME>                                23390
<OTHER-INCOME>                                    3182
<EXPENSES-NET>                                   15820
<NET-INVESTMENT-INCOME>                         129306
<REALIZED-GAINS-CURRENT>                         77195
<APPREC-INCREASE-CURRENT>                      1758376
<NET-CHANGE-FROM-OPS>                          1964877
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       100035
<DISTRIBUTIONS-OF-GAINS>                         38015
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         160242
<NUMBER-OF-SHARES-REDEEMED>                      50676
<SHARES-REINVESTED>                               4991
<NET-CHANGE-IN-ASSETS>                         5156662
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        12235
<OVERDISTRIB-NII-PRIOR>                            956
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               82
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  15857
<AVERAGE-NET-ASSETS>                           6942466
<PER-SHARE-NAV-BEGIN>                            22.64
<PER-SHARE-NII>                                  0.336
<PER-SHARE-GAIN-APPREC>                          4.898
<PER-SHARE-DIVIDEND>                             0.329
<PER-SHARE-DISTRIBUTIONS>                        0.125
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              27.42
<EXPENSE-RATIO>                                   0.20
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED> 
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 032
   <NAME> VANGUARD STOCK MARKET INDEX FUND-INSTITUTIONAL SHARES
<MULTIPLIER> 1,000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          8365070
<INVESTMENTS-AT-VALUE>                        11954647
<RECEIVABLES>                                    85915
<ASSETS-OTHER>                                    1925
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                12042487
<PAYABLE-FOR-SECURITIES>                          1572
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       287796
<TOTAL-LIABILITIES>                             289368
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       8092915
<SHARES-COMMON-STOCK>                            89179
<SHARES-COMMON-PRIOR>                            66413
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                             242
<ACCUMULATED-NET-GAINS>                          41321
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       3619125
<NET-ASSETS>                                   2445357
<DIVIDEND-INCOME>                               118554
<INTEREST-INCOME>                                23390
<OTHER-INCOME>                                    3182
<EXPENSES-NET>                                   15820
<NET-INVESTMENT-INCOME>                         129306
<REALIZED-GAINS-CURRENT>                         77195
<APPREC-INCREASE-CURRENT>                      1758376
<NET-CHANGE-FROM-OPS>                          1964877
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        28557
<DISTRIBUTIONS-OF-GAINS>                         10094
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          33554
<NUMBER-OF-SHARES-REDEEMED>                      12173
<SHARES-REINVESTED>                               1385
<NET-CHANGE-IN-ASSETS>                         5156662
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        12235
<OVERDISTRIB-NII-PRIOR>                            956
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               82
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  15857
<AVERAGE-NET-ASSETS>                           1907075
<PER-SHARE-NAV-BEGIN>                            22.64
<PER-SHARE-NII>                                  0.359
<PER-SHARE-GAIN-APPREC>                          4.898
<PER-SHARE-DIVIDEND>                             0.352
<PER-SHARE-DISTRIBUTIONS>                        0.125
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              27.42
<EXPENSE-RATIO>                                   0.10
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED> 
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 041
   <NAME> VANGUARD VALUE INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1,000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          2077416
<INVESTMENTS-AT-VALUE>                         2622203
<RECEIVABLES>                                   355862
<ASSETS-OTHER>                                     442
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 2978507
<PAYABLE-FOR-SECURITIES>                        359770
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        12024
<TOTAL-LIABILITIES>                             371794
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       1982252
<SHARES-COMMON-STOCK>                           107548
<SHARES-COMMON-PRIOR>                            86130
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                             551
<ACCUMULATED-NET-GAINS>                          80108
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        544904
<NET-ASSETS>                                   2420609
<DIVIDEND-INCOME>                                41768
<INTEREST-INCOME>                                  398
<OTHER-INCOME>                                      54
<EXPENSES-NET>                                    4763
<NET-INVESTMENT-INCOME>                          37457
<REALIZED-GAINS-CURRENT>                        148039
<APPREC-INCREASE-CURRENT>                       110054
<NET-CHANGE-FROM-OPS>                           295550
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        36542
<DISTRIBUTIONS-OF-GAINS>                         98153
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          39652
<NUMBER-OF-SHARES-REDEEMED>                      23806
<SHARES-REINVESTED>                               5572
<NET-CHANGE-IN-ASSETS>                          811172
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        34787
<OVERDISTRIB-NII-PRIOR>                            186
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               37
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   4763
<AVERAGE-NET-ASSETS>                           2149394
<PER-SHARE-NAV-BEGIN>                            20.85
<PER-SHARE-NII>                                  0.366
<PER-SHARE-GAIN-APPREC>                          2.647
<PER-SHARE-DIVIDEND>                             0.363
<PER-SHARE-DISTRIBUTIONS>                        0.990
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              22.51
<EXPENSE-RATIO>                                   0.22
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED> 
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 042
   <NAME> VANGUARD VALUE INDEX FUND-INSTITUTIONAL SHARES
<MULTIPLIER> 1,000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JUL-02-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          2077416
<INVESTMENTS-AT-VALUE>                         2622203
<RECEIVABLES>                                   355862
<ASSETS-OTHER>                                     442
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 2978507
<PAYABLE-FOR-SECURITIES>                        359770
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                        12024
<TOTAL-LIABILITIES>                             371794
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       1982252
<SHARES-COMMON-STOCK>                             8269
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                             551
<ACCUMULATED-NET-GAINS>                          80108
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        544904
<NET-ASSETS>                                    186104
<DIVIDEND-INCOME>                                41768
<INTEREST-INCOME>                                  398
<OTHER-INCOME>                                      54
<EXPENSES-NET>                                    4763
<NET-INVESTMENT-INCOME>                          37457
<REALIZED-GAINS-CURRENT>                        148039
<APPREC-INCREASE-CURRENT>                       110054
<NET-CHANGE-FROM-OPS>                           295550
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         1280
<DISTRIBUTIONS-OF-GAINS>                          4565
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           8040
<NUMBER-OF-SHARES-REDEEMED>                          3
<SHARES-REINVESTED>                                232
<NET-CHANGE-IN-ASSETS>                          811172
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        34787
<OVERDISTRIB-NII-PRIOR>                            186
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               37
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   4763
<AVERAGE-NET-ASSETS>                             60885
<PER-SHARE-NAV-BEGIN>                            23.22
<PER-SHARE-NII>                                  0.196
<PER-SHARE-GAIN-APPREC>                         (0.06)
<PER-SHARE-DIVIDEND>                             0.236
<PER-SHARE-DISTRIBUTIONS>                         0.61
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              22.51
<EXPENSE-RATIO>                                   0.12
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED> 
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 051
   <NAME> VANGUARD GROWTH INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1,000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          4947187
<INVESTMENTS-AT-VALUE>                         6898318
<RECEIVABLES>                                   835822
<ASSETS-OTHER>                                    1058
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 7735198
<PAYABLE-FOR-SECURITIES>                        856779
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         9919
<TOTAL-LIABILITIES>                             866698
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       4877998
<SHARES-COMMON-STOCK>                           209802
<SHARES-COMMON-PRIOR>                           104984
<ACCUMULATED-NII-CURRENT>                          374
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          38663
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       1951465
<NET-ASSETS>                                   6644305
<DIVIDEND-INCOME>                                45207
<INTEREST-INCOME>                                 1732
<OTHER-INCOME>                                      14
<EXPENSES-NET>                                    8993
<NET-INVESTMENT-INCOME>                          37960
<REALIZED-GAINS-CURRENT>                         72886
<APPREC-INCREASE-CURRENT>                      1404145
<NET-CHANGE-FROM-OPS>                          1514991
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        36372
<DISTRIBUTIONS-OF-GAINS>                         23155
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         140735
<NUMBER-OF-SHARES-REDEEMED>                      37803
<SHARES-REINVESTED>                               1885
<NET-CHANGE-IN-ASSETS>                         4503167
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                            521
<OVERDIST-NET-GAINS-PRIOR>                        8937
<GROSS-ADVISORY-FEES>                               37
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   8993
<AVERAGE-NET-ASSETS>                           4065327
<PER-SHARE-NAV-BEGIN>                            22.53
<PER-SHARE-NII>                                  0.230
<PER-SHARE-GAIN-APPREC>                          9.244
<PER-SHARE-DIVIDEND>                             0.219
<PER-SHARE-DISTRIBUTIONS>                        0.115
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              31.67
<EXPENSE-RATIO>                                   0.22
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<RESTATED> 
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 052
   <NAME> VANGUARD GROWTH INDEX FUND-INSTITUTIONAL SHARES
<MULTIPLIER> 1,000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             MAY-14-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          4947187
<INVESTMENTS-AT-VALUE>                         6898318
<RECEIVABLES>                                   835822
<ASSETS-OTHER>                                    1058
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 7735198
<PAYABLE-FOR-SECURITIES>                        856779
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         9919
<TOTAL-LIABILITIES>                             866698
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       4877998
<SHARES-COMMON-STOCK>                             7079
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                          374
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          38663
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       1951465
<NET-ASSETS>                                    224195
<DIVIDEND-INCOME>                                45207
<INTEREST-INCOME>                                 1732
<OTHER-INCOME>                                      14
<EXPENSES-NET>                                    8993
<NET-INVESTMENT-INCOME>                          37960
<REALIZED-GAINS-CURRENT>                         72886
<APPREC-INCREASE-CURRENT>                      1404145
<NET-CHANGE-FROM-OPS>                          1514991
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          693
<DISTRIBUTIONS-OF-GAINS>                           813
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           7955
<NUMBER-OF-SHARES-REDEEMED>                        925
<SHARES-REINVESTED>                                 49
<NET-CHANGE-IN-ASSETS>                         4503167
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                            521
<OVERDIST-NET-GAINS-PRIOR>                        8937
<GROSS-ADVISORY-FEES>                               37
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   8993
<AVERAGE-NET-ASSETS>                             94331
<PER-SHARE-NAV-BEGIN>                            26.49
<PER-SHARE-NII>                                  0.167
<PER-SHARE-GAIN-APPREC>                          5.315
<PER-SHARE-DIVIDEND>                             0.187
<PER-SHARE-DISTRIBUTIONS>                        0.115
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              31.67
<EXPENSE-RATIO>                                   0.12
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 061
   <NAME> VANGUARD SMALL-CAP INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          2986293
<INVESTMENTS-AT-VALUE>                         3228056
<RECEIVABLES>                                    33117
<ASSETS-OTHER>                                     558
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 3261731
<PAYABLE-FOR-SECURITIES>                         20743
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       208632
<TOTAL-LIABILITIES>                             229375
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2769161
<SHARES-COMMON-STOCK>                           130588
<SHARES-COMMON-PRIOR>                           111668
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                             641
<ACCUMULATED-NET-GAINS>                          14857
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        248979
<NET-ASSETS>                                   2768079
<DIVIDEND-INCOME>                                38503
<INTEREST-INCOME>                                 5515
<OTHER-INCOME>                                    2866
<EXPENSES-NET>                                    6682
<NET-INVESTMENT-INCOME>                          40202
<REALIZED-GAINS-CURRENT>                        199544
<APPREC-INCREASE-CURRENT>                     (318857)
<NET-CHANGE-FROM-OPS>                          (79111)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        37309
<DISTRIBUTIONS-OF-GAINS>                        188747
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          42704
<NUMBER-OF-SHARES-REDEEMED>                      33911
<SHARES-REINVESTED>                              10127
<NET-CHANGE-IN-ASSETS>                          243062
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        18730
<OVERDISTRIB-NII-PRIOR>                            381
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              100
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   6686
<AVERAGE-NET-ASSETS>                           2686647
<PER-SHARE-NAV-BEGIN>                            23.75
<PER-SHARE-NII>                                  0.311
<PER-SHARE-GAIN-APPREC>                        (1.007)
<PER-SHARE-DIVIDEND>                             0.304
<PER-SHARE-DISTRIBUTIONS>                        1.550
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              21.20
<EXPENSE-RATIO>                                   0.24
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 062
   <NAME> VANGUARD SMALL-CAP INDEX FUND-INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                          2986293
<INVESTMENTS-AT-VALUE>                         3228056
<RECEIVABLES>                                    33117
<ASSETS-OTHER>                                     558
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                 3261731
<PAYABLE-FOR-SECURITIES>                         20743
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       208632
<TOTAL-LIABILITIES>                             229375
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2769161
<SHARES-COMMON-STOCK>                            12467
<SHARES-COMMON-PRIOR>                             5762
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                             641
<ACCUMULATED-NET-GAINS>                          14857
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        248979
<NET-ASSETS>                                    264277
<DIVIDEND-INCOME>                                38503
<INTEREST-INCOME>                                 5515
<OTHER-INCOME>                                    2866
<EXPENSES-NET>                                    6682
<NET-INVESTMENT-INCOME>                          40202
<REALIZED-GAINS-CURRENT>                        199544
<APPREC-INCREASE-CURRENT>                     (318857)
<NET-CHANGE-FROM-OPS>                          (79111)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                         3153
<DISTRIBUTIONS-OF-GAINS>                         14670
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           6477
<NUMBER-OF-SHARES-REDEEMED>                        385
<SHARES-REINVESTED>                                613
<NET-CHANGE-IN-ASSETS>                          243062
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                        18730
<OVERDISTRIB-NII-PRIOR>                            381
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                              100
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                   6686
<AVERAGE-NET-ASSETS>                            197759
<PER-SHARE-NAV-BEGIN>                            23.75
<PER-SHARE-NII>                                  0.336
<PER-SHARE-GAIN-APPREC>                        (1.007)
<PER-SHARE-DIVIDEND>                             0.329
<PER-SHARE-DISTRIBUTIONS>                        1.550
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              21.20
<EXPENSE-RATIO>                                   0.12
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 071
   <NAME> VANGUARD MID-CAP INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             APR-20-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                           232879
<INVESTMENTS-AT-VALUE>                          241691
<RECEIVABLES>                                    33858
<ASSETS-OTHER>                                      42
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  275591
<PAYABLE-FOR-SECURITIES>                         30190
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         1056
<TOTAL-LIABILITIES>                              31246
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        220564
<SHARES-COMMON-STOCK>                            19066
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                              29
<ACCUMULATED-NET-GAINS>                          14760
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          9050
<NET-ASSETS>                                    205657
<DIVIDEND-INCOME>                                 1184
<INTEREST-INCOME>                                  165
<OTHER-INCOME>                                       9
<EXPENSES-NET>                                     215
<NET-INVESTMENT-INCOME>                           1143
<REALIZED-GAINS-CURRENT>                         15845
<APPREC-INCREASE-CURRENT>                         9050
<NET-CHANGE-FROM-OPS>                            26038
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          962
<DISTRIBUTIONS-OF-GAINS>                           907
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          20969
<NUMBER-OF-SHARES-REDEEMED>                       2058
<SHARES-REINVESTED>                                155
<NET-CHANGE-IN-ASSETS>                          244345
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               20
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    215
<AVERAGE-NET-ASSETS>                            113560
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                  0.053
<PER-SHARE-GAIN-APPREC>                          0.840
<PER-SHARE-DIVIDEND>                             0.053
<PER-SHARE-DISTRIBUTIONS>                        0.050
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.79
<EXPENSE-RATIO>                                   0.25
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 072
   <NAME> VANGUARD MID-CAP INDEX FUND-INSTITUTIONAL SHARES
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             MAY-20-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                           232879
<INVESTMENTS-AT-VALUE>                          241691
<RECEIVABLES>                                    33858
<ASSETS-OTHER>                                      42
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  275591
<PAYABLE-FOR-SECURITIES>                         30190
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         1056
<TOTAL-LIABILITIES>                              31246
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        220564
<SHARES-COMMON-STOCK>                             3586
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                              29
<ACCUMULATED-NET-GAINS>                          14760
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          9050
<NET-ASSETS>                                     38688
<DIVIDEND-INCOME>                                 1184
<INTEREST-INCOME>                                  165
<OTHER-INCOME>                                       9
<EXPENSES-NET>                                     215
<NET-INVESTMENT-INCOME>                           1143
<REALIZED-GAINS-CURRENT>                         15845
<APPREC-INCREASE-CURRENT>                         9050
<NET-CHANGE-FROM-OPS>                            26038
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          210
<DISTRIBUTIONS-OF-GAINS>                           178
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           3559
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                 27
<NET-CHANGE-IN-ASSETS>                          244345
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               20
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    215
<AVERAGE-NET-ASSETS>                             25293
<PER-SHARE-NAV-BEGIN>                            10.03
<PER-SHARE-NII>                                  0.055
<PER-SHARE-GAIN-APPREC>                          0.814
<PER-SHARE-DIVIDEND>                             0.059
<PER-SHARE-DISTRIBUTIONS>                        0.050
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.79
<EXPENSE-RATIO>                                   0.12
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 081
   <NAME> VANGUARD SMALL-CAP VALUE INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             APR-20-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                           131281
<INVESTMENTS-AT-VALUE>                          119913
<RECEIVABLES>                                    15221
<ASSETS-OTHER>                                      21
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  135155
<PAYABLE-FOR-SECURITIES>                         19053
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         3537
<TOTAL-LIABILITIES>                              22590
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        123517
<SHARES-COMMON-STOCK>                            12885
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                              66
<ACCUMULATED-NET-GAINS>                            482
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       (11368)
<NET-ASSETS>                                    112565
<DIVIDEND-INCOME>                                  642
<INTEREST-INCOME>                                  103
<OTHER-INCOME>                                      33
<EXPENSES-NET>                                     139
<NET-INVESTMENT-INCOME>                            639
<REALIZED-GAINS-CURRENT>                           482
<APPREC-INCREASE-CURRENT>                      (11368)
<NET-CHANGE-FROM-OPS>                          (10247)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          705
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          15327
<NUMBER-OF-SHARES-REDEEMED>                       2516
<SHARES-REINVESTED>                                 74
<NET-CHANGE-IN-ASSETS>                          112565
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               20
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                    139
<AVERAGE-NET-ASSETS>                             80848
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                  0.045
<PER-SHARE-GAIN-APPREC>                        (1.250)
<PER-SHARE-DIVIDEND>                             0.055
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               8.74
<EXPENSE-RATIO>                                   0.25
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000036405
<NAME> VANGUARD INDEX FUNDS
<SERIES>
   <NUMBER> 091
   <NAME> VANGUARD SMALL-CAP GROWTH INDEX FUND-INVESTOR SHARES
<MULTIPLIER> 1000
<CURRENCY> US
       
<S>                             <C>
<PERIOD-TYPE>                   OTHER
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             APR-20-1998
<PERIOD-END>                               DEC-31-1998
<EXCHANGE-RATE>                                      1
<INVESTMENTS-AT-COST>                            85766
<INVESTMENTS-AT-VALUE>                           91324
<RECEIVABLES>                                    12618
<ASSETS-OTHER>                                      14
<OTHER-ITEMS-ASSETS>                                 0
<TOTAL-ASSETS>                                  103956
<PAYABLE-FOR-SECURITIES>                         11177
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         2661
<TOTAL-LIABILITIES>                              13838
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                         90155
<SHARES-COMMON-STOCK>                             9451
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                              28
<ACCUMULATED-NET-GAINS>                         (5567)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                          5558
<NET-ASSETS>                                     90118
<DIVIDEND-INCOME>                                  226
<INTEREST-INCOME>                                   88
<OTHER-INCOME>                                      38
<EXPENSES-NET>                                      99
<NET-INVESTMENT-INCOME>                            253
<REALIZED-GAINS-CURRENT>                        (5567)
<APPREC-INCREASE-CURRENT>                         5558
<NET-CHANGE-FROM-OPS>                              244
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                          281
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          10819
<NUMBER-OF-SHARES-REDEEMED>                       1393
<SHARES-REINVESTED>                                 25
<NET-CHANGE-IN-ASSETS>                           90118
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                               20
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                     99
<AVERAGE-NET-ASSETS>                             57505
<PER-SHARE-NAV-BEGIN>                            10.00
<PER-SHARE-NII>                                   0.03
<PER-SHARE-GAIN-APPREC>                         (0.47)
<PER-SHARE-DIVIDEND>                              0.03
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.53
<EXPENSE-RATIO>                                   0.25
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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