| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 41 |
3.7%
|
|
| 2017 | 192 |
17.5%
|
|
| 2018 | 170 |
15.5%
|
|
| 2019 | 169 |
15.4%
|
|
| 9999 | NO RESPONSE | 12 |
1.1%
|
| Sysmiss | 512 |
46.7%
|