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Exchange rates | 12 Months Ended
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Dec. 31, 2018
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Exchange rates | 1. Exchange rates The results of operations have been translated into US dollars at the average rates of exchange for the year. In the case of sterling, the translation rate is $1=£0.75 (2017: $1=£0.78, 2016: $1=£0.74). In the case of the euro, the translation rate is $1=€0.85 (2017: $1=€0.89, 2016: $1=€0.90). Assets and liabilities have been translated into US dollars at the rates of exchange on the last day of the year. In the case of sterling, the translation rate is $1=£0.78 (2017: $1=£0.74, 2016: $1=£0.81). In the case of the euro, the translation rate is $1=€0.87 (2017: $1=€0.83, 2016: $1=€0.95).

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- Definition The entire disclosure for the effect of changes in foreign exchange rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2018-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2018-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2018-03-16 + Details
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