|                                                                                                            |   | Year                  Ended December 31, |    |
|-----------------------------------------------------------------------------------------------------------------|--------|------------------------------------------|---------|
|                                                                                                            |   | 2003                                     |    | 2004 |   | 2005 |   | 2006 |   |   | 2007 |   |
| EARNINGS                                                                                                        |   |                                |    |    |   |    |   |    |   |   |   |   |
| Income                    Before Income Taxes                                                                   |   | $                                        | 130,696 |   | $ | 204,837 |   | $ | 228,082 |   | $ | 197,273 |   | $  |  204,394 |   |
| Fixed                    Charges (as below)                                                                     |   |                                     | 156,507 |   |   | 139,421 |   |   | 133,293 |   |   | 142,388 |   |   |  161,849 |   |
| Total                  Earnings                                                                                 |   | $                                        | 287,203 |   | $ | 344,258 |   | $ | 361,375 |   | $ | 339,661 |   | $ |  366,243 |   |
|                                                                                                            |   |                                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| FIXED                  CHARGES                                                                                  |   |                                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest                  Expense                                                                               |   | $                                        | 83,054  |   | $ | 69,071 |   | $ | 65,041 |   | $ | 72,723 |   | $ |  80,034 |   |
| Credit                  for Allowance for Borrowed Funds Used                     During Construction |   |                                     | 3,153   |   |   | 1,750 |   |   | 4,352 |   |   | 7,465 |   |   |  5,315 |   |
| Estimated                Interest Element in Lease Rentals                                                      |   |                                     | 70,300  |   |   | 68,600 |   |   | 63,900 |   |   | 62,200 |   |   |  76,500 |   |
| Total                  Fixed                  Charges                                                           |   | $                                        | 156,507 |   | $ | 139,421 |   | $ | 133,293 |   | $ | 142,388 |   | $ |  161,849 |   |
|                                                                                                            |   |                                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Ratio                  of Earnings to Fixed                  Charges                                            |   |                                     | 1.83    |   |   | 2.46 |   |   | 2.71 |   |   | 2.38 |   |   |  2.26 |   |
|                                                                                                            |   |                                     |    |   |   |   |   |   |   |   |   |   |   |   |   |   |