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Cost of sales (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Cost of Sales
Cost of sales is analysed as follows:
 
 
  
2019
 
  
2018
 
  
2017
 
Opening inventories
  
 
84,227
 
  
 
91,077
 
  
 
91,014
 
Purchases
  
 
139,205
 
  
 
177,591
 
  
 
180,872
 
Labour costs
  
 
86,209
 
  
 
89,827
 
  
 
92,330
 
Third party manufacturers costs
  
 
3,919
 
  
 
6,039
 
  
 
8,725
 
Other manufacturing costs
  
 
29,519
 
  
 
29,004
 
  
 
37,605
 
Government grants related to PPE
  
 
(1,463
) 
  
 
(1,061
) 
  
 
(1,068
) 
Closing inventories
  
 
(69,685
) 
  
 
(84,227
) 
  
 
(91,077
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
Total
  
 
271,931
 
  
 
308,250
 
  
 
318,401