EXHIBIT 11-21





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|-------- | ----------------------------------------------------------------------------------------- |  | ------------------------------------- | ------- |  | ---- | - | ------- | ---- |  | - | ------- | 
|         |                                                                                           |  | Year Ended December 31                |        
|         |                                                                                           |  |                                       |        
|         |                                                                                           |  | 2000                                  |         |  | 1999 |   |         | 1998 | 
|         |                                                                                           |  |                                       |         |  |      |   |         |      | 
|         |                                                                                           |  | (Thousands, except per share amounts) |        
|BASIC:  
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|         | Net Income                                                                                |  | $                                     | 468,550 |  |      | $ | 482,653 |      |  | $ | 443,012 | 
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|         | Weighted average number of common
shares outstanding (a)                                  |  |                                       | 143,116 |  |      |   | 145,047 |      |  |   | 145,076 | 
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|         | Earnings per share of Common Stock
based on weighted average number
of shares outstanding |  | $                                     | 3.27    |  |      | $ | 3.33    |      |  | $ | 3.05    | 
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|DILUTED:
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|         | Net Income                                                                                |  | $                                     | 468,550 |  |      | $ | 482,653 |      |  | $ | 443,012 | 
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|         | Weighted average number of common
shares outstanding (a)                                  |  |                                       | 143,116 |  |      |   | 145,047 |      |  |   | 145,076 | 
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|         | Incremental shares from assumed
conversion of options                                     |  |                                       | 149     |  |      |   | 89      |      |  |   | 106     | 
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|         |                                                                                           |  |                                       |         |  |      |   |         |      |  |   |        
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|         |                                                                                           |  |                                       | 143,265 |  |      |   | 145,136 |      |  |   | 145,182 | 
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|         |                                                                                           |  |                                       |         |  |      |   |         |      |  |   |        
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|         | Earnings per share of Common Stock
assuming conversion of options                         |  | $                                     | 3.27    |  |      | $ | 3.33    |      |  | $ | 3.05    | 



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|(a) |  | Based on a daily average.
|--- |  | -------------------------