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Finance income and costs (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Statement of Profit or Loss | Recognized in the statement of profit or loss:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Fair value gains on derivative financial instruments |  |  | 589,555 |  |  |  | 385,560 |  |  |  | 1,070 |
Interest income on bank deposits |  |  | 278,599 |  |  |  | 158,206 |  |  |  | 303,221 |
Interest income on financial assets measured at amortized cost |  |  | 185,004 |  |  |  | 445,943 |  |  |  | 436,024 |
Credit finance income |  |  | 36,186 |  |  |  | 74,522 |  |  |  | 13,865 |
Other |  |  | 1,105 |  |  |  | 563 |  |  |  | 1,859 |
Finance income |  |  | 1,090,449 |  |  |  | 1,064,794 |  |  |  | 756,039 |
Net foreign exchange losses |  |  | (718,501 | ) |  |  | (782,463 | ) |  |  | (489,320 | )
Interest expenses for financial liabilities measured at amortized cost |  |  | (385,386 | ) |  |  | (343,290 | ) |  |  | (224,724 | )
Interest expenses for derivative financial instruments |  |  | (244,841 | ) |  |  | (93,038 | ) |  |  | — |
Late payment interest expense |  |  | (29,115 | ) |  |  | — |  |  |  | (68,083 | )
Option premium charges |  |  | (27,172 | ) |  |  | (10,114 | ) |  |  | (2,290 | )
Other |  |  | (8,300 | ) |  |  | (8,688 | ) |  |  | (15,097 | )
Finance costs |  |  | (1,413,315 | ) |  |  | (1,237,593 | ) |  |  | (799,514 | )
Net finance costs |  |  | (322,866 | ) |  |  | (172,799 | ) |  |  | (43,475 | )

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