<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-START> JAN-01-2000 <PERIOD-END> MAR-31-2000 <CASH> 261,036 <SECURITIES> 0 <RECEIVABLES> 305,599 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 566,635 <PP&E> 13,704,820 <DEPRECIATION> (8,546,245) <TOTAL-ASSETS> 5,725,210 <CURRENT-LIABILITIES> 26,333 <BONDS> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <COMMON> 0 <OTHER-SE> 0 <TOTAL-LIABILITY-AND-EQUITY> 5,725,210 <SALES> 438,023 <TOTAL-REVENUES> 440,677 <CGS> 54,333 <TOTAL-COSTS> 54,333 <OTHER-EXPENSES> 315,487 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 70,857 <INCOME-TAX> 0 <INCOME-CONTINUING> 70,857 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 70,857 <EPS-BASIC> 0 <EPS-DILUTED> 0