| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 11 |
0.8%
|
|
| 2017 | 259 |
18.8%
|
|
| 2018 | 216 |
15.7%
|
|
| 2019 | 218 |
15.8%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 673 |
48.8%
|