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v3.22.2.2

Segment information (Details 2) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Supplier A |  |  |
Supplier accounting for more than 5% of Group's purchases | 42 | 30 | 53
Supplier B |  |  |
Supplier accounting for more than 5% of Group's purchases | 13 | 10 | 7
Supplier C |  |  |
Supplier accounting for more than 5% of Group's purchases | 6 | 9 | 6
Supplier D |  |  |
Supplier accounting for more than 5% of Group's purchases | 6 | 6 | 6
Supplier E |  |  |
Supplier accounting for more than 5% of Group's purchases | 5 | 5 | 0
Supplier F |  |  |
Supplier accounting for more than 5% of Group's purchases | 0 | 12 | 0

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