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Principles of consolidation (Tables)
12 Months Ended
Dec. 31, 2017
Principles Of Consolidation  
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

2017

  Exchange
rate at
December 31,
2017
  Annual
average
exchange rate
2016
  Exchange
rate at
December 31,
2016
  Annual
average
exchange rate
2015
  Exchange
rate at
December 31,
2015
U.S. Dollar     1.13       1.20       1.11       1.05       1.11       1.09  
Pound Sterling     0.88       0.89       0.82       0.86       0.73       0.73  
Norwegian Krone     9.33       9.83       9.29       9.09       8.95       9.60  
Australian Dollar     1.47       1.53       1.49       1.46       1.48       1.49