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COST OF SALES
12 Months Ended
Dec. 31, 2020
Analysis of income and expense [abstract]  
COST OF SALES COST OF SALES
Year ended December 31,
202020192018
Inventories at the beginning of the year2,158,298 2,689,829 2,550,930 
Effect of initial inflation adjustment (Note 3 (cc))— — 191,708 
Translation differences— (21,919)(413,436)
Plus: Charges for the year
Raw materials and consumables used and
other movements
5,359,938 6,165,654 6,961,704 
Services and fees112,924 151,373 158,551 
Labor cost546,045 611,615 699,447 
Depreciation of property, plant and equipment527,283 508,934 456,522 
Amortization of intangible assets14,624 17,805 25,374 
Maintenance expenses371,368 467,090 519,625 
Office expenses6,131 8,513 8,586 
Insurance10,641 9,674 8,769 
Change of obsolescence allowance(1,279)8,413 17,322 
Recovery from sales of scrap and by-products(20,892)(23,793)(27,744)
Others16,623 17,550 15,799 
Less: Inventories at the end of the year(2,001,781)(2,158,298)(2,689,829)
Cost of Sales7,099,923 8,452,440 8,483,328