Other income by function is detailed as follows:
| From January 1 | From January 1 | From January 1 | ||||||||||
| to December 31, 2017 | to December 31, 2016 | to December 31, 2015 | ||||||||||
| Nature of other income | ThCh$ | ThCh$ | ThCh$ | |||||||||
| Sale of property, plant and equipment | 2,376,128 | 5,816,356 | 838,114 | |||||||||
| Severance payments | 1,942,466 | 2,206,908 | 377,054 | |||||||||
| Sale of wood, cartons and other products | 263,240 | 228,236 | 86,929 | |||||||||
| Office rental | 119,278 | 89,964 | 54,680 | |||||||||
| Income tax refund | 87,556 | 45,506 | 233,476 | |||||||||
| Charge regularization | 227,424 | 92,009 | 64,318 | |||||||||
| Gain obtained for business combination (*) | 2,485,008 | — | — | |||||||||
| Other | 130,310 | 182,924 | 29,222 | |||||||||
| Total | 7,631,410 | 8,661,903 | 1,683,792 | |||||||||
(*) See note 12 Goodwill.