<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> JUN-30-2000
<PERIOD-START> JUL-01-1999
<PERIOD-END> JUN-30-2000
<CASH> 8,181
<SECURITIES> 0
<RECEIVABLES> 287,792
<ALLOWANCES> 0
<INVENTORY> 156,853
<CURRENT-ASSETS> 577,728
<PP&E> 4,852,017
<DEPRECIATION> 2,277,573
<TOTAL-ASSETS> 3,866,311
<CURRENT-LIABILITIES> 952,802
<BONDS> 300,605
0
0
<COMMON> 803
<OTHER-SE> 253,376
<TOTAL-LIABILITY-AND-EQUITY> 3,866,311
<SALES> 2,094,850
<TOTAL-REVENUES> 2,159,209
<CGS> 1,503,154
<TOTAL-COSTS> 2,052,662
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 55,289
<INCOME-PRETAX> 106,547
<INCOME-TAX> (493)
<INCOME-CONTINUING> 107,040
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 107,040
<EPS-BASIC> 1.35
<EPS-DILUTED> 0
</TABLE>