Movement of Reserves of share- based payments:
| Stock | ||||||||||||||||||||
| Opening | option | Deferred | Net movement | Closing | ||||||||||||||||
| Periods | balance | plan | tax | of the period | balance | |||||||||||||||
| ThUS$ | ThUS$ | ThUS$ | ThUS$ | ThUS$ | ||||||||||||||||
| From January 1 to December 31, 2015 | 29,642 | 8,924 | (2,919 | ) | 6,005 | 35,647 | ||||||||||||||
| From January 1 to December 31, 2016 | 35,647 | 3,698 | (807 | ) | 2,891 | 38,538 | ||||||||||||||
| From January 1 to December 31, 2017 | 38,538 | 943 | - | 943 | 39,481 | |||||||||||||||