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Summary of significant accounting policies (Details 1) - $ / perunit | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Closing foreign exchange rate | [1] | 86.19 | 79.62 | 80.15
US Dollar [Member] |  |  |  |
Closing foreign exchange rate |  | 694.77 | 614.75 | 669.47
Euros [Member] |  |  |  |
Closing foreign exchange rate |  | 794.75 | 739.15 | 705.60
Argentinean Pesos [Member] |  |  |  |
Closing foreign exchange rate |  | 18.43 | 32.96 | 42.13
Uruguayan Peso [Member] |  |  |  |
Closing foreign exchange rate |  | 21.44 | 21.34 | 22.82
Canadian Dollar [Member] |  |  |  |
Closing foreign exchange rate |  | 509.62 | 491.05 | 498.38
Sterling Pound [Member] |  |  |  |
Closing foreign exchange rate |  | 882.36 | 832.09 | 826.10
Paraguayan Guarani [Member] |  |  |  |
Closing foreign exchange rate |  | 0.12 | 0.11 | 0.12
Bolivians [Member] |  |  |  |
Closing foreign exchange rate |  | 101.28 | 89.61 | 97.59
Colombian Peso [Member] |  |  |  |
Closing foreign exchange rate |  | 0.21 | 0.21 | 0.22
Unidades de Fomento [Member] |  |  |  |
Closing foreign exchange rate | [2] | 27,565.79 | 26,798.14 | 26,347.98
[1] | The Unidad Indexada (UI) is a Uruguay inflation-indexed, Uruguayan peso-denominated monetary unit. The UI rate is set daily in advance based on changes in the previous month's inflation rate.
[2] | The Unidad de Fomento (UF) is a Chilean inflation-indexed, Chilean peso-denominated monetary unit. The UF rate is set daily in advance based on changes in the previous month's inflation rate.

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- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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