| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 184 |
13.4%
|
|
| 2018 | 231 |
16.8%
|
|
| 2019 | 201 |
14.6%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 761 |
55.2%
|