| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 2016 | 1 |
1.9%
|
|
| 2017 | 1 |
1.9%
|
|
| 2018 | 9 |
16.7%
|
|
| 2019 | 37 |
68.5%
|
|
| 2020 | 6 |
11.1%
|
|
| Sysmiss | 66 |