| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 133 |
6.8%
|
|
| 2018 | 256 |
13%
|
|
| 2019 | 198 |
10.1%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 1379 |
70.1%
|