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ACCOUNTING STANDARDS AND BASIS OF PREPARATION - IAS 29 (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
ACCOUNTING STANDARDS AND BASIS OF PREPARATION        
Annual 53.80% 47.60% 24.80% 34.60%
Accumulated 3 years 183.40% 148.00% 96.80% 102.30%