| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 17 |
11%
|
| 2013 | 1 |
0.6%
|
|
| 2016 | 1 |
0.6%
|
|
| 2017 | 1 |
0.6%
|
|
| 2020 | 4 |
2.6%
|
|
| 2021 | 4 |
2.6%
|
|
| 2022 | 26 |
16.8%
|
|
| 2023 | 52 |
33.5%
|
|
| 2024 | 49 |
31.6%
|
|
| Sysmiss | 213 |