| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.6%
|
| 2009 | 1 |
0.8%
|
|
| 2010 | 1 |
0.8%
|
|
| 2012 | 1 |
0.8%
|
|
| 2015 | 2 |
1.6%
|
|
| 2018 | 3 |
2.4%
|
|
| 2019 | 4 |
3.2%
|
|
| 2020 | 10 |
8.1%
|
|
| 2021 | 12 |
9.7%
|
|
| 2022 | 30 |
24.2%
|
|
| 2023 | 43 |
34.7%
|
|
| 2024 | 15 |
12.1%
|
|
| Sysmiss | 256 |