Exhibit 7.1

Ratio of earnings to fixed charges

|                                           |  | Year ended
December 31, |   |         |  |         |   |          |  
|------------------------------------------ |  | ----------------------- | - | ------- |  | ------- | - | -------- | -
|
|
|
|Earnings:                                  |  |                         |   |         |  |         |   |          |  
|Pretax income                              |  | 319,135                 |   | 338,591 |  | 333,005 |   | (263,538 | )
|Less: Income from investees                |  | 3,793                   |   | 3,615   |  | (4,559  | ) | (5,917   | )
|Plus Fixed Charges:                        |  |                         |   |         |  |         |   |          |  
|Interest Expense                           |  | 4,605                   |   | 6,912   |  | 2,315   |   | 84,327   |  
|Capitalized interest                       |  | 4,436                   |   |         |  |         |   |          |  
|Operating leases33% of rental expense     |  | 32,875                  |   | 36,574  |  | 32,041  |   | 4,577    |  
|Amortization of debt issuance costs        |  |                         |   |         |  |         |   | 2,067    |  
|Less: Capitalized interest                 |  | (4,436                  | ) |         |  |         |   |          |  
|Plus: Amortization of capitalized interest |  | 222                     |   | 887     |  | 776     |   | 111      |  
|Adjusted earnings                          |  | 357,480                 |   | 379,349 |  | 372,696 |   | (168,606 | )
|Total fixed charges (as above)             |  | 41,916                  |   | 43,486  |  | 34,356  |   | 90,971   |  
|Ratio of earnings to fixed charges         |  | 8.53                    |   | 8.72    |  | 10.85   |   | (1.85    | )
|Rental Expense (Note 7)                    |  | 98,626                  |   | 109,721 |  | 96,123  |   | 13,732   |  
|Deficiency                                 |  |                         |   |         |  |         |   | 259,577  |  
|US GAAP                                    |  |                         |   |         |  |         |   |          |  
|Pretax income                              |  | 225,595                 |   | 293,979 |  | 228,347 |   | (296,681 | )
|Less: Income from investees                |  | 3,793                   |   | 3,615   |  | (4,559  | ) | (5,917   | )
|Plus Fixed Charges:                        |  |                         |   |         |  |         |   |          |  
|Interest Expense                           |  | 4,605                   |   | 6,912   |  | 2,315   |   | 84,327   |  
|Capitalized interest                       |  | 4,436                   |   |         |  |         |   |          |  
|Operating leases33% of rental expense     |  | 32,875                  |   | 36,574  |  | 32,041  |   | 4,577    |  
|Amortization of debt issuance costs        |  |                         |   |         |  |         |   | 2,067    |  
|Less: Capitalized interest                 |  | (4,436                  | ) |         |  |         |   |          |  
|Plus: Amortization of capitalized interest |  | 222                     |   | 887     |  | 776     |   | 111      |  
|Adjusted earnings                          |  | 263,940                 |   | 334,737 |  | 268,038 |   | (201,749 | )
|Total fixed charges (as above)             |  | 41,916                  |   | 43,486  |  | 34,356  |   | 90,971   |  
|Ratio of earnings to fixed charges         |  | 6.30                    |   | 7.70    |  | 7.80    |   | (2.22    | )
|Rental Expense (Note 7)                    |  | 98,626                  |   | 109,721 |  | 96,123  |   | 13,732   |  
|Deficiency                                 |  |                         |   |         |  |         |   | 292,720  |  

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