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Exchange rates in US$

12 Months Ended

Dec. 31, 2021

Foreign exchange rates [abstract]

Exchange rates in US$

40 Exchange rates in US$

The principal exchange rates used in the preparation of the 2021 financial statements were:


			Full-year average									Year-end
			2021			2020			2019			2021			2020			2019
Pound sterling			1.38			1.28			1.28			1.35			1.36			1.31
Australian dollar			0.75			0.69			0.70			0.73			0.77			0.70
Canadian dollar			0.80			0.75			0.75			0.78			0.78			0.77
Euro			1.18			1.14			1.12			1.13			1.23			1.12
South African rand			0.068			0.061			0.069			0.063			0.068			0.071