| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 187 |
13.6%
|
|
| 2018 | 227 |
16.5%
|
|
| 2019 | 199 |
14.4%
|
|
| 9999 | NO RESPONSE | 2 |
0.1%
|
| Sysmiss | 763 |
55.4%
|