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<PAGE> PAGE 2
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<PAGE> PAGE 3
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<PAGE> PAGE 4
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<PAGE> PAGE 5
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<PAGE> PAGE 6
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<PAGE> PAGE 7
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<PAGE> PAGE 8
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<PAGE> PAGE 9
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SIGNATURE SARA L. BADLER
TITLE ATTORNEY
<TABLE> <S> <C>
<ARTICLE> 6
<SERIES>
<NUMBER> 11
<NAME> SR FLOATING RATE
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JUL-31-2000
<PERIOD-START> AUG-01-1999
<PERIOD-END> JAN-31-2000
<INVESTMENTS-AT-COST> 1,725,002,307
<INVESTMENTS-AT-VALUE> 1,679,454,765
<RECEIVABLES> 22,975,998
<ASSETS-OTHER> 1,047,993
<OTHER-ITEMS-ASSETS> 17,688,765
<TOTAL-ASSETS> 1,721,167,521
<PAYABLE-FOR-SECURITIES> 9,560,981
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 4,291,232
<TOTAL-LIABILITIES> 13,852,213
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,745,891,039
<SHARES-COMMON-STOCK> 173,671,374
<SHARES-COMMON-PRIOR> 145,951,374
<ACCUMULATED-NII-CURRENT> 6,088,149
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 883,662
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (45,547,542)
<NET-ASSETS> 1,707,315,308
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 70,674,892
<OTHER-INCOME> 722,242
<EXPENSES-NET> (12,565,110)
<NET-INVESTMENT-INCOME> 58,832,024
<REALIZED-GAINS-CURRENT> 1,110,577
<APPREC-INCREASE-CURRENT> (44,635,650)
<NET-CHANGE-FROM-OPS> 15,306,951
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (56,047,850)
<DISTRIBUTIONS-OF-GAINS> (1,076,619)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 41,528,218
<NUMBER-OF-SHARES-REDEEMED> (17,846,760)
<SHARES-REINVESTED> 4,038,542
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<ACCUMULATED-NII-PRIOR> 3,303,975
<ACCUMULATED-GAINS-PRIOR> 849,704
<OVERDISTRIB-NII-PRIOR> 0
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<GROSS-ADVISORY-FEES> 7,733,324
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<PER-SHARE-NII> 0.360
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<RETURNS-OF-CAPITAL> 0.000
<PER-SHARE-NAV-END> 9.831
<EXPENSE-RATIO> 1.54
</TABLE>
