| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 2016 | 1 |
2.6%
|
|
| 2017 | 1 |
2.6%
|
|
| 2018 | 1 |
2.6%
|
|
| 2019 | 18 |
47.4%
|
|
| 2020 | 17 |
44.7%
|
|
| Sysmiss | 734 |