| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 2 |
0.2%
|
|
| 2018 | 46 |
5.7%
|
|
| 2019 | 55 |
6.8%
|
|
| 2020 | 6 |
0.7%
|
|
| 9999 | NO RESPONSE | 1 |
0.1%
|
| Sysmiss | 701 |
86.4%
|