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Significant accounting policies, estimates and judgements (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Significant Accounting Policies Estimates And Judgements [Abstract]  
Disclosure of effect of changes in foreign exchange rates [text block]
The main foreign exchange rates used to translate the financial statements into the parent’s functional currency are indicated below:
 
(currency amount for €1)
 
 
Annual 
average 
exchange rate 
2018
 
 
Exchange 
rate at 
December 31, 
2018
 
 
Annual 
average 
exchange rate 
2017
 
 
Exchange 
rate at 
December 31, 
2017
 
 
Annual 
average 
exchange rate 
2016
 
 
Exchange 
rate at 
December 31, 
2016
 
U.S. Dollar
 
 
 
 
1.18
 
 
 
 
 
1.15
 
 
 
 
 
1.13
 
 
 
 
 
1.20
 
 
 
 
 
1.11
 
 
 
 
 
1.05
 
 
Pound Sterling
 
 
 
 
0.88
 
 
 
 
 
0.89
 
 
 
 
 
0.88
 
 
 
 
 
0.88
 
 
 
 
 
0.82
 
 
 
 
 
0.86
 
 
Norwegian Krone
 
 
 
 
9.60
 
 
 
 
 
9.94
 
 
 
 
 
9.33
 
 
 
 
 
9.83
 
 
 
 
 
9.29
 
 
 
 
 
9.09
 
 
Australian Dollar
 
 
 
 
1.58
 
 
 
 
 
1.62
 
 
 
 
 
1.47
 
 
 
 
 
1.53
 
 
 
 
 
1.49
 
 
 
 
 
1.46