| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 30 |
1.5%
|
|
| 2017 | 271 |
13.8%
|
|
| 2018 | 267 |
13.6%
|
|
| 2019 | 155 |
7.9%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 1243 |
63.2%
|