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<TABLE> <S> <C>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<CASH> 14,300
<SECURITIES> 11,900
<RECEIVABLES> 150,900
<ALLOWANCES> 2,100
<INVENTORY> 29,300
<CURRENT-ASSETS> 250,300
<PP&E> 3,486,000
<DEPRECIATION> 1,609,100
<TOTAL-ASSETS> 2,164,300
<CURRENT-LIABILITIES> 223,500
<BONDS> 0
0
0
<COMMON> 1,800
<OTHER-SE> 827,300
<TOTAL-LIABILITY-AND-EQUITY> 2,164,300
<SALES> 438,400
<TOTAL-REVENUES> 438,400
<CGS> 278,500
<TOTAL-COSTS> 278,500
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 27,200
<INCOME-PRETAX> 134,100
<INCOME-TAX> 51,500
<INCOME-CONTINUING> 82,600
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 82,600
<EPS-BASIC> 0.45
<EPS-DILUTED> 0.44
</TABLE>
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