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25. Insurance (Tables)
12 Months Ended
Dec. 31, 2017
Insurance Tables  
Insurance coverage
  Coverage
   
Specified risks – fire 2,007,219
Engineering risk 1,043,368
Guarantee insurance for escrow deposit 500
Traditional guarantee insurance 100
Civil liability– D&O (Directors and Officers) 100
Civil liability – works 85,530
Domestic and international transportation 448
Civil liability – operations 3,000
Other 14 
Total 3,140,279