<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<RESTATED>
<S> <C> <C> <C> <C>
<C>
<PERIOD-TYPE> 6-MOS 3-MOS 6-MOS 3-MOS
<FISCAL-YEAR-END> DEC-31-2000 DEC-31-2000 DEC-31-1999 DEC-31-1999
<PERIOD-END> JUN-30-2000 MAR-31-2000 JUN-30-1999 MAR-31-1999
<CASH> 9,900 4,800 20,600 11,000
<SECURITIES> 0 0 0 0
<RECEIVABLES> 298,500 215,600 235,700 86,500
<ALLOWANCES> 0 0 0 0
<INVENTORY> 9,200 11,600 7,200 9,400
<CURRENT-ASSETS> 367,400 271,800 280,100 226,900
<PP&E> 6,673,300 6,448,600 6,179,300 6,300,900
<DEPRECIATION> 4,152,500 4,052,300 3,974,000 4,064,300
<TOTAL-ASSETS> 2,972,100 2,747,300 2,560,800 2,532,700
<CURRENT-LIABILITIES> 416,300 333,500 228,400 225,500
<BONDS> 963,800 939,900 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> 1,010,700 877,300 669,200 626,200
<TOTAL-LIABILITY-AND-EQUITY> 2,972,100 2,747,300 2,560,800 2,532,700
<SALES> 1,351,800 596,900 813,400 353,800
<TOTAL-REVENUES> 1,383,400 610,500 855,700 372,000
<CGS> 353,400 172,800 335,100 172,600
<TOTAL-COSTS> 470,500 241,400 420,400 211,600
<OTHER-EXPENSES> 589,200 258,500 334,600 132,600
<LOSS-PROVISION> 0 0 0 0
<INTEREST-EXPENSE> 31,600 14,700 40,100 20,500
<INCOME-PRETAX> 260,500 82,400 34,600 (5,400)
<INCOME-TAX> 47,300 5,000 (32,700) (24,400)
<INCOME-CONTINUING> 213,200 77,400 67,300 19,000
<DISCONTINUED> 0 0 0 0
<EXTRAORDINARY> 0 0 0 0
<CHANGES> 0 0 0 0
<NET-INCOME> 213,200 77,400 67,300 19,000
<EPS-BASIC> 2.18 0.79 0.69 0.20
<EPS-DILUTED> 2.15 0.78 0.68 0.19
</TABLE>