| | January-December | | ||||
| | 2017 | | 2016 | | 2015 | |
Depreciation for the year | | ThU.S.$ | | ThU.S.$ | | ThU.S.$ | |
Cost of sales | | 381,725 | | 371,170 | | 365,401 | |
Administrative expenses | | 23,005 | | 21,546 | | 19,084 | |
Other expenses | | 3,494 | | 2,119 | | 3,707 | |
Total | | 408,224 | | 394,835 | | 388,192 | |