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34. Basic and diluted earnings per share (Tables)
 12 Months Ended
Dec. 31, 2018
Basic And Diluted Earnings Per Share  
Basic and diluted earnings per share
     12.31.18     12.31.17       12.31.16 
Profit (Loss) for the year attributable to the owners of the Company                     4,297,466                    5,080,635                        240,771
Weighted average number of common shares outstanding                       890,492                       898,280                        897,043
Basic and diluted  profit (loss) earnings per share – in pesos                             4.83                             5.66                              0.27