<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM JUNE 30,
2000 FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<S> <C> <C>
<PERIOD-TYPE> 3-MOS 6-MOS
<FISCAL-YEAR-END> DEC-31-1999 DEC-31-1999
<PERIOD-START> APR-01-2000 JAN-01-2000
<PERIOD-END> JUN-30-2000 JUN-30-2000
<CASH> 1,166,358 1,166,358
<SECURITIES> 345,223 345,223
<RECEIVABLES> 244,783 244,783
<ALLOWANCES> 0 0
<INVENTORY> 0 0
<CURRENT-ASSETS> 1,756,364 1,756,364
<PP&E> 20,166,587 20,166,587
<DEPRECIATION> 5,663,373 5,663,373
<TOTAL-ASSETS> 16,259,578 16,259,578
<CURRENT-LIABILITIES> 239,832 239,832
<BONDS> 0 0
0 0
0 0
<COMMON> 0 0
<OTHER-SE> 16,019,746 16,019,746
<TOTAL-LIABILITY-AND-EQUITY> 16,259,575 16,259,578
<SALES> 595,930 1,162,743
<TOTAL-REVENUES> 613,248 1,196,916
<CGS> 0 0
<TOTAL-COSTS> 0 0
<OTHER-EXPENSES> 250,566 481,269
<LOSS-PROVISION> 6,810 6,810
<INTEREST-EXPENSE> 0 0
<INCOME-PRETAX> 355,572 708,837
<INCOME-TAX> 0 0
<INCOME-CONTINUING> 355,572 708,837
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> 355,572 708,837
<EPS-BASIC> 7.61 15.16
<EPS-DILUTED> 7.61 15.16
</TABLE>