| vii. | Sensitivity analysis: |
| As of December 31, 2016 | ||||||||||||||||
| Discount rate | Rate of future salary increase | |||||||||||||||
| 0.5% increase | 0.5% decrease | 0.5% increase | 0.5% decrease | |||||||||||||
| NT$ | NT$ | NT$ | NT$ | |||||||||||||
| (In Thousands) | (In Thousands) | (In Thousands) | (In Thousands) | |||||||||||||
|
Decrease (increase) in defined benefit obligation |
$ | 290,068 | $ | (311,920 | ) | $ | (276,029 | ) | $ | 260,500 | ||||||
| As of December 31, 2017 | ||||||||||||||||
| Discount rate | Rate of future salary increase | |||||||||||||||
| 0.5% increase | 0.5% decrease | 0.5% increase | 0.5% decrease | |||||||||||||
| NT$ | NT$ | NT$ | NT$ | |||||||||||||
| (In Thousands) | (In Thousands) | (In Thousands) | (In Thousands) | |||||||||||||
|
Decrease (increase) in defined benefit obligation |
$ | 283,095 | $ | (303,570 | ) | $ | (266,069 | ) | $ | 251,815 | ||||||