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Summary of significant accounting policies (Tables) | 6 Months Ended
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Jun. 30, 2026
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Summary of Exchange Rates | The most important exchange rates that have been used in preparing the financial statements are:
|  | Closing rate |  |  | Average rate |
1 US dollar equals: |  | 30 June 2026 |  |  | 31 December 2025 |  |  | 30 June 2026 |  |  | 30 June 2025 |
Argentine peso |  |  | 1 482.53 |  |  |  | 1 459.80 |  |  |  | - |  |  |  | - |
Brazilian real |  |  | 5.18 |  |  |  | 5.50 |  |  |  | 5.19 |  |  |  | 5.83 |
Canadian dollar |  |  | 1.42 |  |  |  | 1.37 |  |  |  | 1.37 |  |  |  | 1.41 |
Chinese yuan |  |  | 6.79 |  |  |  | 7.00 |  |  |  | 6.88 |  |  |  | 7.26 |
Colombian peso |  |  | 3 441.78 |  |  |  | 3 749.18 |  |  |  | 3 682.52 |  |  |  | 4 201.57 |
Euro |  |  | 0.88 |  |  |  | 0.85 |  |  |  | 0.85 |  |  |  | 0.92 |
Mexican peso |  |  | 17.47 |  |  |  | 17.97 |  |  |  | 17.53 |  |  |  | 20.03 |
Peruvian sol |  |  | 3.42 |  |  |  | 3.37 |  |  |  | 3.42 |  |  |  | 3.69 |
Pound sterling |  |  | 0.76 |  |  |  | 0.74 |  |  |  | 0.74 |  |  |  | 0.77 |
South African rand |  |  | 16.37 |  |  |  | 16.55 |  |  |  | 16.41 |  |  |  | 18.46 |
South Korean won |  |  | 1 550.63 |  |  |  | 1 444.93 |  |  |  | 1 475.55 |  |  |  | 1 439.97 |

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