| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 38 |
0.6%
|
|
| 2018 | 963 |
15.1%
|
|
| 2019 | 1043 |
16.3%
|
|
| 2020 | 12 |
0.2%
|
|
| 9999 | NO RESPONSE | 7 |
0.1%
|
| Sysmiss | 4331 |
67.7%
|