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Shareholders' contributions (Tables)
12 Months Ended
Dec. 31, 2021
Statement of changes in equity [abstract]  
Schedule of Share Capital
 Number of sharesShare capital and
share premium
At January 1, 2019122,382 1,084,076 
Restricted shares and units vested (Note 23)— 4,455 
Purchase of own shares— (3,219)
At December 31,2019122,382 1,085,312 
Restricted shares and units vested (Note 23)— 4,182 
Purchase of own shares— (3,106)
At December 31,2020122,382 1,086,388 
Restricted shares units vested (Note 23)— 3,594 
Purchase of own shares— (55,349)
At December 31,2021122,382 1,034,633 
 
(1)Treasury shares were used to settle these options and units.