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<TABLE> <S> <C>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> SEP-30-2000
<PERIOD-START> OCT-01-1999
<PERIOD-END> JUN-30-2000
<CASH> 88,699
<SECURITIES> 276,671
<RECEIVABLES> 102,193
<ALLOWANCES> 2,503
<INVENTORY> 25,006
<CURRENT-ASSETS> 232,252
<PP&E> 1,493,943
<DEPRECIATION> 823,802
<TOTAL-ASSETS> 1,196,975
<CURRENT-LIABILITIES> 65,720
<BONDS> 0
0
0
<COMMON> 5,353
<OTHER-SE> 909,848
<TOTAL-LIABILITY-AND-EQUITY> 1,196,975
<SALES> 425,195
<TOTAL-REVENUES> 443,169
<CGS> 340,398
<TOTAL-COSTS> 340,398
<OTHER-EXPENSES> 6,586
<LOSS-PROVISION> (300)
<INTEREST-EXPENSE> 2,389
<INCOME-PRETAX> 85,475
<INCOME-TAX> 35,903
<INCOME-CONTINUING> 51,950
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 51,950
<EPS-BASIC> 1.05
<EPS-DILUTED> 1.04
</TABLE>
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