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INCOME TAX - Tas rates (Details)
12 Months Ended
Jan. 01, 2021
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
INCOME TAX        
Inflation adjustment allocated to first year (as a percent)   17.00%    
Inflation adjustment allocated to next five years (as a percent)   83.00%    
Applicable tax rate 30.00% 30.00% 30.00% 35.00%
Tax rate on dividends 7.00%