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Exchange rates in US$ | 12 Months Ended
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Dec. 31, 2019
Foreign exchange rates [abstract] |
Exchange rates in US$ | 41 Exchange rates in US$ The principal exchange rates used in the preparation of the 2019 financial statements were:
| Full-year average | Year-end
| 2019 |  | 2018 |  | 2017 |  | 2019 |  | 2018 |  | 2017 |
Sterling | 1.28 |  | 1.34 |  | 1.29 |  | 1.31 |  | 1.27 |  | 1.34 |
Australian dollar | 0.70 |  | 0.75 |  | 0.77 |  | 0.70 |  | 0.70 |  | 0.78 |
Canadian dollar | 0.75 |  | 0.77 |  | 0.77 |  | 0.77 |  | 0.73 |  | 0.79 |
Euro | 1.12 |  | 1.18 |  | 1.13 |  | 1.12 |  | 1.14 |  | 1.20 |
South African rand | 0.069 |  | 0.076 |  | 0.075 |  | 0.071 |  | 0.069 |  | 0.081 |

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