<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000
<S> <C> <C> <C> <C>
<PERIOD-TYPE> 12-MOS 9-MOS 6-MOS 3-MOS
<FISCAL-YEAR-END> DEC-31-1999 DEC-31-1999 DEC-31-1999 DEC-31-1999
<PERIOD-END> DEC-31-1999 SEP-30-1999 JUN-30-1999 MAR-31-1999
<CASH> 40,600 10,500 20,600 11,000
<SECURITIES> 0 0 0 0
<RECEIVABLES> 217,400 269,100 235,700 86,500
<ALLOWANCES> 0 0 0 0
<INVENTORY> 7,000 10,400 7,200 9,400
<CURRENT-ASSETS> 307,100 323,400 280,100 226,900
<PP&E> 6,287,900 6,261,200 6,179,300 6,300,900
<DEPRECIATION> 3,967,700 4,035,100 3,974,000 4,064,300
<TOTAL-ASSETS> 2,710,000 2,632,000 2,560,800 2,532,700
<CURRENT-LIABILITIES> 342,900 268,600 228,400 225,500
<BONDS> 975,000 1,067,700 1,248,000 1,276,100
0 0 0 0
0 0 0 0
<COMMON> 1,000 1,000 1,000 1,000
<OTHER-SE> 805,000 737,600 669,200 626,200
<TOTAL-LIABILITY-AND-EQUITY> 2,710,000 2,632,000 2,560,800 2,532,700
<SALES> 1,895,100 1,314,800 813,400 353,800
<TOTAL-REVENUES> 1,963,400 1,368,800 855,700 372,000
<CGS> 673,800 505,400 335,100 172,600
<TOTAL-COSTS> 858,400 628,800 420,400 211,600
<OTHER-EXPENSES> 787,900 531,600 334,600 132,600
<LOSS-PROVISION> 0 0 0 0
<INTEREST-EXPENSE> 77,300 59,700 40,100 20,500
<INCOME-PRETAX> 185,100 109,900 34,600 (5,400)
<INCOME-TAX> (28,000) (28,500) (32,700) (24,400)
<INCOME-CONTINUING> 213,100 138,400 67,300 19,000
<DISCONTINUED> 0 0 0 0
<EXTRAORDINARY> 0 0 0 0
<CHANGES> 0 0 0 0
<NET-INCOME> 213,100 138,400 67,300 19,000
<EPS-BASIC> 2.19 1.42 0.69 0.20
<EPS-DILUTED> 2.16 1.40 0.68 0.19
</TABLE>