| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 209 |
15.2%
|
|
| 2018 | 238 |
17.3%
|
|
| 2019 | 203 |
14.7%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 727 |
52.8%
|