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CURRENT AND NON-CURRENT EMPLOYEE BENEFITS - Assumptions (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
CURRENT AND NON-CURRENT EMPLOYEE BENEFITS    
Discount rate (0.05%) 2.70%
Expected salary increase rate 2.00% 2.00%
Turnover rate 7.68% 5.40%
Retirement age of women 60 years 60 years
Retirement age of men 65 years 65 years