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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Schedule of Cash and Cash Equivalents
   
31 December
2019
   
31 December
2018
 
Cash in hand
   131    144 
Banks
   10,238,310    7,413,113 
– Demand deposits
   632,022    587,007 
– Time deposits
   9,606,288    6,826,106 
Other cash and cash equivalents
   274    5,982 
  
 
 
   
 
 
 
Cash and cash equivalents
  
 
10,238,715
 
  
 
7,419,239