<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
       
<S>                             <C>                         <C>                       <C> 
<PERIOD-TYPE>                   3-MOS                       9-MOS                     12-mos
<FISCAL-YEAR-END>                         JUN-30-1997                  JUN-30-1997               Jun-30-1997
<PERIOD-START>                            JAN-01-1997                  JUL-01-1996               Jul-01-1995
<PERIOD-END>                              MAR-31-1997                  MAR-31-1997               Jun-30-1996
<CASH>                                              0                    3,906,902                 1,776,112
<SECURITIES>                                        0                            0                         0
<RECEIVABLES>                                       0                    9,213,765                 3,953,159
<ALLOWANCES>                                        0                    1,519,000                   604,000
<INVENTORY>                                         0                            0                         0 
<CURRENT-ASSETS>                                    0                   15,343,323                 7,270,936
<PP&E>                                              0                   73,292,176                35,853,889
<DEPRECIATION>                                      0                   19,120,447                17,510,520
<TOTAL-ASSETS>                                      0                   89,352,697                28,786,087
<CURRENT-LIABILITIES>                               0                   16,043,575                 9,124,289
<BONDS>                                             0                   33,980,518                 6,308,840
<PREFERRED-MANDATORY>                               0                            0                         0
<PREFERRED>                                         0                            0                         0
<COMMON>                                            0                      140,958                    95,238
<OTHER-SE>                                          0                   27,183,079                10,325,960
<TOTAL-LIABILITY-AND-EQUITY>                        0                   89,352,697                28,786,087
<SALES>                                    19,512,498                   52,409,183                         0
<TOTAL-REVENUES>                           19,512,498                   52,409,183                         0
<CGS>                                      12,729,563                   38,026,625                         0
<TOTAL-COSTS>                              12,729,563                   38,026,625                         0
<OTHER-EXPENSES>                            5,429,661                   12,121,650                         0
<LOSS-PROVISION>                                    0                            0                         0
<INTEREST-EXPENSE>                            746,654                    1,525,509                         0
<INCOME-PRETAX>                               606,620                      735,399                         0
<INCOME-TAX>                                  244,390                      940,405                         0
<INCOME-CONTINUING>                           362,230                     (205,006)                        0
<DISCONTINUED>                                      0                            0                         0
<EXTRAORDINARY>                                     0                            0                         0
<CHANGES>                                           0                            0                         0
<NET-INCOME>                                  362,230                     (205,006)                        0
<EPS-PRIMARY>                                     .02                         (.02)                        0
<EPS-DILUTED>                                       0                            0                         0
        

</TABLE>