| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 209 |
15.2%
|
|
| 2018 | 235 |
17.1%
|
|
| 2019 | 201 |
14.6%
|
|
| 9999 | NO RESPONSE | 2 |
0.1%
|
| Sysmiss | 731 |
53%
|