| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
3.1%
|
| 2009 | 1 |
1%
|
|
| 2013 | 1 |
1%
|
|
| 2015 | 1 |
1%
|
|
| 2016 | 1 |
1%
|
|
| 2017 | 2 |
2.1%
|
|
| 2018 | 2 |
2.1%
|
|
| 2019 | 3 |
3.1%
|
|
| 2020 | 10 |
10.4%
|
|
| 2021 | 7 |
7.3%
|
|
| 2022 | 20 |
20.8%
|
|
| 2023 | 33 |
34.4%
|
|
| 2024 | 12 |
12.5%
|
|
| Sysmiss | 507 |