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Major exchange rates
 12 Months Ended
Dec. 31, 2021
Effects Of Changes In Foreign Exchange Rates [Abstract]  
Major exchange rates Major exchange rates
The following major exchange rates have been used in preparing the consolidated financial statements:
 closing ratesaverage rates
1 XXX = x,xxxx USDDecember 31, 2021December 31, 2020December 31, 2019202120202019
EUR1.1326 1.2271 1.1234 1.1894 1.1384 1.1213 
GBP1.3479 1.3649 1.3204 1.3778 1.2860 1.2755