<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED>

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                          292356                  432644                  177130
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   326026                  269761                  387063
<ALLOWANCES>                                     14602                   14602                   14602
<INVENTORY>                                      78376                  109875                   78121
<CURRENT-ASSETS>                                819688                 1032493                  757481
<PP&E>                                        10635410                10870424                11843183
<DEPRECIATION>                                 2178870                 2378743                 2594429
<TOTAL-ASSETS>                                 9287869                 9536349                10017276
<CURRENT-LIABILITIES>                          2935018                 3552515                 4231048
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                         29674                   29724                   29794
<OTHER-SE>                                     6323177                 5954110                 5756434
<TOTAL-LIABILITY-AND-EQUITY>                   9287869                 9536349                10017276
<SALES>                                         532739                 1557844                 2755898
<TOTAL-REVENUES>                               3400567                 9026548                14808199
<CGS>                                           270921                  785855                 1340297
<TOTAL-COSTS>                                  2843534                 8818589                14815857
<OTHER-EXPENSES>                                   (3)                   (553)                   (735)
<LOSS-PROVISION>                                  7500                       0                  (7500)
<INTEREST-EXPENSE>                               41316                   70558                  110536
<INCOME-PRETAX>                                 515720                  137954                (117459)
<INCOME-TAX>                                         0                       0                       0
<INCOME-CONTINUING>                             515720                  137954                (117459)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                    515720                  137954                (117459)
<EPS-PRIMARY>                                      .17                     .05                   (.04)
<EPS-DILUTED>                                      .17                     .04                   (.04)


</TABLE>