The sensitivity of the defined benefit obligation to changes in the weighted principal assumptions as of December 31, 2017, are as follows:
| Changes in principal assumption |
Effect on net defined benefit obligation | |||||||
| Increase in principal assumption |
Decrease in principal assumption | |||||||
|
Discount rate (%) |
0.5 p. | 3.96 decrease | 4.19 increase | |||||
|
Salary increase rate (%) |
0.5 p. | 3.00 increase | 4.58 decrease | |||||
|
Turnover (%) |
0.5 p. | 0.46 decrease | 0.43 increase | |||||