<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 3-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> MAR-31-2000
<CASH> 0
<SECURITIES> 0
<RECEIVABLES> 12,265
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 12,383
<PP&E> 859,988
<DEPRECIATION> (554,127)
<TOTAL-ASSETS> 322,159
<CURRENT-LIABILITIES> 16,043
<BONDS> 0
0
0
<COMMON> 0
<OTHER-SE> 211,422
<TOTAL-LIABILITY-AND-EQUITY> 322,159
<SALES> 42,397
<TOTAL-REVENUES> 42,519
<CGS> 0
<TOTAL-COSTS> 21,545
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 0
<INCOME-PRETAX> 20,974
<INCOME-TAX> (7,301)
<INCOME-CONTINUING> 13,673
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 13,673
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>