| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 183 |
13.3%
|
|
| 2018 | 230 |
16.7%
|
|
| 2019 | 197 |
14.3%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 767 |
55.7%
|