<TABLE> <S> <C>
<ARTICLE> 5
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<CASH> 127,257
<SECURITIES> 143,488
<RECEIVABLES> 132,012
<ALLOWANCES> 0
<INVENTORY> 37,579
<CURRENT-ASSETS> 448,352
<PP&E> 2,173,122
<DEPRECIATION> (1,088,758)
<TOTAL-ASSETS> 1,594,294
<CURRENT-LIABILITIES> 143,278
<BONDS> 0
0
0
<COMMON> 1,151
<OTHER-SE> 1,405,908
<TOTAL-LIABILITY-AND-EQUITY> 1,594,294
<SALES> 0
<TOTAL-REVENUES> 278,833
<CGS> 0
<TOTAL-COSTS> 181,307
<OTHER-EXPENSES> 48,804
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 55,308
<INCOME-TAX> 9,847
<INCOME-CONTINUING> 45,461
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 45,461
<EPS-BASIC> 0.40
<EPS-DILUTED> 0.39
</TABLE>