Exhibit 7.1

RATIOS OF EARNINGS TO FIXED CHARGES

The following table sets out our
ratios of earnings to fixed charges for each of the five years ended 31 December 2010, 2009, 2008, 2007, and 2006 based on information derived from our consolidated financial statements, which are prepared in accordance with International
Financial Reporting Standards (IFRS).



|                                                                       |  |                        |        |  |      |  |        |      |  |  |       |  |  |      |       |  |  |  |       | 
|---------------------------------------------------------------------- |  | ---------------------- | ------ |  | ---- |  | ------ | ---- |  |  | ----- |  |  | ---- | ----- |  |  |  | ----- | 
|                                                                       |  | Year ended 31 December |       
|                                                                       |  | 2010                   |        |  | 2009 |  |        | 2008 |  |  | 2007  |  |  | 2006 |      
|Earnings:                                                              |  |                        |        |  |      |  |        |      |  |  |       |  |  |      |       |  |  |  |       | 
|Profit from operations before taxes and share of results of associates |  |                        | 7,161  |  |      |  | 7,150  |      |  |  | 3,740 |  |  |      | 5,054 |  |  |  | 3,332 | 
|Add: Fixed charges (below)                                             |  |                        | 4,313  |  |      |  | 5,014  |      |  |  | 1,965 |  |  |      | 1,035 |  |  |  | 860   | 
|Less: Interest Capitalized (below)                                     |  |                        | 35     |  |      |  | 4      |      |  |  |      |  |  |      |      |  |  |  |      | 
|                                                                       |  |                        |        |  |      |  |        |      |  |  |       |  |  |      |       |  |  |  |       | 
|Total earnings                                                         |  |                        | 11,439 |  |      |  | 12,160 |      |  |  | 5,705 |  |  |      | 6,089 |  |  |  | 4,192 | 
|                                                                       |  |                        |        |  |      |  |        |      |  |  |       |  |  |      |       |  |  |  |       | 
|Fixed charges:                                                         |  |                        |        |  |      |  |        |      |  |  |       |  |  |      |       |  |  |  |       | 
|Interest expense and similar charges                                   |  |                        | 3,848  |  |      |  | 4,394  |      |  |  | 1,761 |  |  |      | 926   |  |  |  | 771   | 
|Accretion expense                                                      |  |                        | 351    |  |      |  | 526    |      |  |  | 127   |  |  |      | 49    |  |  |  | 30    | 
|Interest capitalized                                                   |  |                        | 35     |  |      |  | 4      |      |  |  |      |  |  |      |      |  |  |  |      | 
|Estimated interest portion of rental expense                           |  |                        | 79     |  |      |  | 90     |      |  |  | 77    |  |  |      | 60    |  |  |  | 59    | 
|                                                                       |  |                        |        |  |      |  |        |      |  |  |       |  |  |      |       |  |  |  |       | 
|Total fixed charges                                                    |  |                        | 4,313  |  |      |  | 5,014  |      |  |  | 1,965 |  |  |      | 1,035 |  |  |  | 860   | 
|                                                                       |  |                        |        |  |      |  |        |      |  |  |       |  |  |      |       |  |  |  |       | 
|Ratio of earnings to fixed charges                                     |  |                        | 2.65   |  |      |  | 2.43   |      |  |  | 2.90  |  |  |      | 5.88  |  |  |  | 4.87  | 
|                                                                       |  |                        |        |  |      |  |        |      |  |  |       |  |  |      |       |  |  |  |       | 

The ratio of earnings to fixed charges represents the number of times fixed charges are covered by earnings.
For the purposes of computing this ratio, earnings consist of profit from operations before taxes and share of results of associates, plus fixed charges, minus interest capitalized during the period. Fixed charges consist of interest and accretion
expense, interest on finance lease obligations, interest capitalized, plus one-third of rent expense on operating leases, estimated by the company as representative of the interest factor attributable to such rent expense.

We did not have any preferred stock outstanding and did not pay or accrue any preferred stock dividends during the periods presented
above.