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27. Benefit plans (Details 3)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Benefit Plans      
Discount rate 5.00% 5.00% 5.00%
Salary increase 1.00% 1.00% 1.00%
Inflation 31.00% 31.00% 18.00%