| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 165 |
8.4%
|
|
| 2018 | 264 |
13.4%
|
|
| 2019 | 212 |
10.8%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 1325 |
67.4%
|