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Operating leases (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Schedule of Future Minimum Lease Payments Under Non-Cancellable Leases

Commitments for minimum lease payments in relation to non-cancellable operating leases are payable as follows:

 

     2017      2016  

Within one year

      144,424        163,336  

Later than one year but not later than five years

      346,832        345,374  

Later than five years

      167,227        101,328  
  

 

 

     

 

 

  
     658,483        610,038  
  

 

 

     

 

 

  
Schedule of Payments Recognized

Rental expense relating to operating leases are as follows:

 

     2017      2016      2015  

Minimum lease payments

      812,385        837,575        751,816  

Contingent rentals

      —          —          1,733  
  

 

 

     

 

 

     

 

 

  

Total

      812,385        837,575        753,549