<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM JUNE 30,2000
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> 219,407 271,407
<SECURITIES> 321,307 329,307
<RECEIVABLES> 37,370 37,370
<ALLOWANCES> 0 0
<INVENTORY> 0 0
<CURRENT-ASSETS> 646,084 646,084
<PP&E> 3,803,639 3,803,639
<DEPRECIATION> 811,338 811,338
<TOTAL-ASSETS> 3,638,385 3,638,385
<CURRENT-LIABILITIES> 94,222 94,222
<BONDS> 0 0
0 0
0 0
<COMMON> 0 0
<OTHER-SE> 3,544,163 3,544,163
<TOTAL-LIABILITY-AND-EQUITY> 3,638,385 3,638,385
<SALES> 101,925 204,410
<TOTAL-REVENUES> 110,333 220,577
<CGS> 0 0
<TOTAL-COSTS> 0 0
<OTHER-EXPENSES> 70,080 130,252
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 0 0
<INCOME-PRETAX> 40,253 90,325
<INCOME-TAX> 0 0
<INCOME-CONTINUING> 40,253 90,325
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> 40,253 90,325
<EPS-BASIC> 2.33 5.23
<EPS-DILUTED> 2.33 5.23
</TABLE>