<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM UNAUDITED
9/30/00 FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 12,345,000
<SECURITIES> 30,512,000
<RECEIVABLES> 7,897,000
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 0
<PP&E> 114,100,000
<DEPRECIATION> 54,977,000
<TOTAL-ASSETS> 129,881,000
<CURRENT-LIABILITIES> 0
<BONDS> 13,691,000
0
0
<COMMON> 28,000
<OTHER-SE> 101,139,000
<TOTAL-LIABILITY-AND-EQUITY> 129,881,000
<SALES> 3,956,000
<TOTAL-REVENUES> 30,029,000
<CGS> 3,123,000
<TOTAL-COSTS> 3,123,000
<OTHER-EXPENSES> 12,801,000
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 524,000
<INCOME-PRETAX> 13,581,000
<INCOME-TAX> 4,310,000
<INCOME-CONTINUING> 7,902,000
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 7,902,000
<EPS-BASIC> 2.88
<EPS-DILUTED> 2.88
</TABLE>