|                                                                               |   | 2011   |   |   | 2010   |   |   | 2009   |   |   | 2008   |   |   | 2007   |   |
|------------------------------------------------------------------------------------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|--------|
|                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Profit                                                                             |   | $      | 378    |   |   | $      | 278    |   |   | $      | 259    |   |   | $      | 385    |   |   | $ | 494 |   |
|                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Add:                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|   Provision for income taxes                                             |   |   | 111    |   |   |   | 40     |   |   |   | 45     |   |   |   | 120    |   |   |   | 234 |   |
|                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Deduct:                                                                            |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|   Partnership income                                                     |   |   | -      |   |   |   | -      |   |   |   | -      |   |   |   | (3     | ) |   |   | (7 | ) |
|                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Profit before income taxes and partnership income                                  |   | $      | 489    |   |   | $      | 318    |   |   | $      | 304    |   |   | $      | 502    |   |   | $ | 721 |   |
|                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Fixed charges:                                                                     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|   Interest expense                                                       |   | $      | 827    |   |   | $      | 917    |   |   | $      | 1,048  |   |   | $      | 1,159  |   |   | $ | 1,132 |   |
|   Rentals at computed interest*                                          |   |   | 5      |   |   |   | 6      |   |   |   | 5      |   |   |   | 6      |   |   |   | 5 |   |
|                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Total fixed charges                                                                |   | $      | 832    |   |   | $      | 923    |   |   | $      | 1,053  |   |   | $      | 1,165  |   |   | $ | 1,137 |   |
|                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Profit before income taxes plus fixed charges                                      |   | $      | 1,321  |   |   | $      | 1,241  |   |   | $      | 1,357  |   |   | $      | 1,667  |   |   | $ | 1,858 |   |
|                                                                               |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Ratio of profit before income taxes plus  fixed charges to fixed charges |   |   | 1.59   |   |   |   | 1.34   |   |   |   | 1.29   |   |   |   | 1.43   |   |   |   | 1.63 |   |