<ARTICLE> 5 <PERIOD-TYPE> YEAR <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-END> DEC-31-1999 <CASH> 12317505 <SECURITIES> 0 <RECEIVABLES> 863257 <ALLOWANCES> 0 <INVENTORY> 0 <CURRENT-ASSETS> 0 <PP&E> 82184577 <DEPRECIATION> 59165441 <TOTAL-ASSETS> 36199898 <CURRENT-LIABILITIES> 0 <BONDS> 0 <COMMON> 0 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 28675899 <TOTAL-LIABILITY-AND-EQUITY> 36199898 <SALES> 0 <TOTAL-REVENUES> 9590876 <CGS> 0 <TOTAL-COSTS> 0 <OTHER-EXPENSES> 3985096 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 0 <INCOME-PRETAX> 5605780 <INCOME-TAX> 0 <INCOME-CONTINUING> 5605780 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 5605780 <EPS-BASIC> 9.83 <EPS-DILUTED> 0