| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 |
10%
|
| 2006 | 1 |
0.9%
|
|
| 2011 | 1 |
0.9%
|
|
| 2012 | 1 |
0.9%
|
|
| 2016 | 1 |
0.9%
|
|
| 2017 | 3 |
2.7%
|
|
| 2018 | 4 |
3.6%
|
|
| 2019 | 3 |
2.7%
|
|
| 2020 | 3 |
2.7%
|
|
| 2021 | 10 |
9.1%
|
|
| 2022 | 10 |
9.1%
|
|
| 2023 | 23 |
20.9%
|
|
| 2024 | 38 |
34.5%
|
|
| 2025 | 1 |
0.9%
|
|
| Sysmiss | 197 |