| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 51 |
3.3%
|
|
| 2018 | 195 |
12.5%
|
|
| 2019 | 9 |
0.6%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 1308 |
83.6%
|