|                                      |   | Year ended December 31,                                                        |     |
|-------------------------------------------|--------|--------------------------------------------------------------------------------|----------|
|                                      |   | 2010                                                                           |     |   | 2009 |   |   | 2008 |   |   | 2007 |   |   | 2006 |   |
|                                      |   | (thousands constant December 31, 2007 pesos for 2006 and 2007 and thousands of |     |
|                                      |   | nominal pesos for 2008, 2009 and 2010, except ratio data)                      |     |
|                                      |   |                                                                           |     |   |   |   |   |   |   |   |   |   |   |   |   |
| Income (Loss) Before Income Tax           |   |                                                                           | (613,348 | ) |   |   | (438,972 | ) |   |   | (470,361 | ) |   |   | 299,631 |   |   |   | 72,509 |   |
| Determination of the Ratio Fixed charges: |   |                                                                           |     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest expense                          |   |                                                                           | 308,075  |   |   |   | 293,225 |   |   |   | 368,400 |   |   |   | 233,628 |   |   |   | 94,093 |   |
| Interest capitalized during period        |   |                                                                           | 10,936   |   |   |   | 26,819 |   |   |   | (50,709 | ) |   |   | 3,942 |   |   |   | 71,815 |   |
| Rental expense                            |   |                                                                           | 25,509   |   |   |   | 24,286 |   |   |   | 21,011 |   |   |   | 18,186 |   |   |   | 21,450 |   |
| Amortization of Debt issuance costs       |   |                                                                           | —  |   |   |   | — |   |   |   | — |   |   |   | 5,966 |   |   |   | (137,603 | ) |
| Total fixed charges                       |   |                                                                           | 344,520  |   |   |   | 344,330 |   |   |   | 338,702 |   |   |   | 261,722 |   |   |   | 49,755 |   |
| Earnings:                                 |   |                                                                           |     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Income (loss) from continuing operations  |   |                                                                           | (613,348 | ) |   |   | (438,972 | ) |   |   | (470,361 | ) |   |   | 299,631 |   |   |   | 72,509 |   |
| Fixed charges                             |   |                                                                           | 344,520  |   |   |   | 344,330 |   |   |   | 338,702 |   |   |   | 261,722 |   |   |   | 49,755 |   |
| Amortization of capitalized interest      |   |                                                                           | 28,053   |   |   |   | 24,342 |   |   |   | 23,772 |   |   |   | 16,032 |   |   |   | 28,852 |   |
| Less: interest capitalized during period  |   |                                                                           | (10,936  | ) |   |   | (26,819 | ) |   |   | 50,709 |   |   |   | (3,942 | ) |   |   | (71,815 | ) |
| Total earnings                            |   |                                                                           | (251,711 | ) |   |   | (97,119 | ) |   |   | (57,178 | ) |   |   | 573,443 |   |   |   | 79,301 |   |
| Ratio of Earnings to Fixed Charges        |   |                                                                           | (0.73    | ) |   |   | (0.28 | ) |   |   | (0.17 | ) |   |   | 2.19 |   |   |   | 1.59 |   |
| Insufficiency (sufficiency)               |   |                                                                           | 596,231  |   |   |   | 441,448 |   |   |   | 395,880 |   |   |   | (311,721 | ) |   |   | (29,546 | ) |

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|                                      |   | Year ended December 31,                                                        |     |
|-------------------------------------------|--------|--------------------------------------------------------------------------------|----------|
|                                      |   | 2010                                                                           |     |   | 2009 |   |   | 2008 |   |   | 2007 |   |   | 2006 |   |
|                                      |   | (thousands constant December 31, 2007 pesos for 2006 and 2007 and thousands of |     |
|                                      |   | nominal pesos for 2008, 2009 and 2010, except ratio data)                      |     |
|                                      |   |                                                                           |     |   |   |   |   |   |   |   |   |   |   |   |   |
| Income (Loss) Before Income Tax           |   |                                                                           | (931,818 | ) |   |   | (365,095 | ) |   |   | (671,457 | ) |   |   | 133,178 |   |   |   | 30,783 |   |
| Determination of the Ratio Fixed charges: |   |                                                                           |     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Interest expense                          |   |                                                                           | 314,412  |   |   |   | 302,035 |   |   |   | 255,662 |   |   |   | 232,912 |   |   |   | 144,038 |   |
| Interest capitalized during period        |   |                                                                           | 4,599    |   |   |   | 18,009 |   |   |   | 62,029 |   |   |   | 4,658 |   |   |   | 21,870 |   |
| Rental expense                            |   |                                                                           | 25,509   |   |   |   | 24,286 |   |   |   | 21,011 |   |   |   | 18,186 |   |   |   | 21,450 |   |
| Amortization of Debt issuance costs       |   |                                                                           | —  |   |   |   | — |   |   |   | — |   |   |   | 5,966 |   |   |   | 41,732 |   |
| Total fixed charges                       |   |                                                                           | 344,520  |   |   |   | 344,330 |   |   |   | 338,702 |   |   |   | 261,722 |   |   |   | 229,090 |   |
| Earnings:                                 |   |                                                                           |     |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
| Income (loss) from continuing operations  |   |                                                                           | (931,818 | ) |   |   | (365,095 | ) |   |   | (671,457 | ) |   |   | 133,178 |   |   |   | 30,783 |   |
| Fixed charges                             |   |                                                                           | 344,520  |   |   |   | 344,330 |   |   |   | 338,702 |   |   |   | 261,722 |   |   |   | 229,090 |   |
| Amortization of capitalized interest      |   |                                                                           | 25,953   |   |   |   | 23,826 |   |   |   | 11,654 |   |   |   | 4,136 |   |   |   | 1,716 |   |
| Less: interest capitalized during period  |   |                                                                           | (4,599   | ) |   |   | (18,009 | ) |   |   | (62,029 | ) |   |   | (4,658 | ) |   |   | (21,870 | ) |
| Total earnings                            |   |                                                                           | (565,944 | ) |   |   | (14,948 | ) |   |   | (383,130 | ) |   |   | 394,378 |   |   |   | 239,719 |   |
| Ratio of Earnings to Fixed Charges        |   |                                                                           | (1.64    | ) |   |   | (0.04 | ) |   |   | (1.13 | ) |   |   | 1.51 |   |   |   | 1.05 |   |
| Insufficiency (sufficiency)               |   |                                                                           | 910,464  |   |   |   | 359,278 |   |   |   | (721,833 | ) |   |   | (132,656 | ) |   |   | (10,629 | ) |

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