| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 167 |
8.5%
|
|
| 2018 | 261 |
13.3%
|
|
| 2019 | 208 |
10.6%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 1330 |
67.6%
|