|                                                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|-------------------------------------------------------------------------------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
| (dollars      in millions)                                                    |   | 2007   |   |   | 2006   |   |   | 2005   |   |   | 2004   |   |   | 2003   |   |
|                                                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Earnings, as      defined:                                                    |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Net      income                                                               |   | $      | 317    |   |   | $      | 328    |   |   | $      | 260    |   |   | $      | 335    |   |   | $ | 297 |   |
| Fixed      charges, as below                                                  |   |   | 188    |   |   |   | 159    |   |   |   | 138    |   |   |   | 122    |   |   |   | 103 |   |
| Income      taxes                                                             |   |   | 144    |   |   |   | 193    |   |   |   | 121    |   |   |   | 174    |   |   |   | 147 |   |
| Total      earnings, as defined                                               |   | $      | 649    |   |   | $      | 680    |   |   | $      | 519    |   |   | $      | 631    |   |   | $ | 547 |   |
|                                                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed Charges, as      defined:                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest      on long-term debt                                               |   | $      | 157    |   |   | $      | 145    |   |   | $      | 116    |   |   | $      | 107    |   |   | $ | 103 |   |
| Other      interest                                                           |   |   | 28     |   |   |   | 10     |   |   |   | 18     |   |   |   | 10     |   |   |   | (6 | ) |
| Imputed      interest factor in rentals – charged                       |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| principally      to operating expenses                                        |   |   | 3      |   |   |   | 4      |   |   |   | 4      |   |   |   | 5      |   |   |   | 6 |   |
| Total      fixed charges, as defined                                          |   |   | 188    |   |   |   | 159    |   |   |   | 138    |   |   |   | 122    |   |   |   | 103 |   |
| Preferred      dividends, as defined                                          |   |   | 2      |   |   |   | 2      |   |   |   | 2      |   |   |   | 2      |   |   |   | 2 |   |
| Total      fixed charges and preferred dividends combined                     |   | $      | 190    |   |   | $      | 161    |   |   | $      | 140    |   |   | $      | 124    |   |   | $ | 105 |   |
|                                                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Ratio      of Earnings to Fixed Charges                                       |   |   | 3.45   |   |   |   | 4.28   |   |   |   | 3.76   |   |   |   | 5.17   |   |   |   | 5.31 |   |
|                                                                          |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Ratio      of Earnings to Fixed Charges and Preferred Dividends      Combined |   |   | 3.42   |   |   |   | 4.22   |   |   |   | 3.71   |   |   |   | 5.08   |   |   |   | 5.21 |   |

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