| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 |
11%
|
| 2011 | 1 |
1%
|
|
| 2014 | 1 |
1%
|
|
| 2017 | 2 |
2%
|
|
| 2018 | 4 |
4%
|
|
| 2019 | 3 |
3%
|
|
| 2020 | 5 |
5%
|
|
| 2021 | 13 |
13%
|
|
| 2022 | 20 |
20%
|
|
| 2023 | 26 |
26%
|
|
| 2024 | 13 |
13%
|
|
| 2025 | 1 |
1%
|
|
| Sysmiss | 115 |