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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM UNAUDITED
6/30/00 FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 10,929,000
<SECURITIES> 38,663,000
<RECEIVABLES> 6,692,000
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 0
<PP&E> 64,879,000
<DEPRECIATION> 31,303,000
<TOTAL-ASSETS> 110,166,000
<CURRENT-LIABILITIES> 0
<BONDS> 5,002,000
0
0
<COMMON> 28,000
<OTHER-SE> 98,032,000
<TOTAL-LIABILITY-AND-EQUITY> 110,166,000
<SALES> 2,463,000
<TOTAL-REVENUES> 16,858,000
<CGS> 1,876,000
<TOTAL-COSTS> 1,876,000
<OTHER-EXPENSES> 6,870,000
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 215,000
<INCOME-PRETAX> 7,897,000
<INCOME-TAX> 3,102,000
<INCOME-CONTINUING> 4,795,000
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 4,795,000
<EPS-BASIC> 1.75
<EPS-DILUTED> 1.75
</TABLE>
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