| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 49 |
4.5%
|
|
| 2018 | 103 |
9.4%
|
|
| 2019 | 65 |
5.9%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 878 |
80.1%
|