| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 214 |
10.9%
|
|
| 2018 | 279 |
14.2%
|
|
| 2019 | 199 |
10.1%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 1274 |
64.8%
|