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Supplementary information on capital management (Tables)
6 Months Ended
Jun. 30, 2018
Supplementary information on capital management  
Schedule of credit ratings
Rating (1)
Standard & Poor´sMoody´sFitch
Corporate Credit Rating BBB-Baa3BBB-
Outlook positivestablestable
(1) A rating is not a recommendation to buy, sell or hold securities of the Company, and may be subject to suspension, change or withdrawal at any time by the assigning rating agency.