| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.9%
|
| 2004 | 1 |
0.9%
|
|
| 2008 | 1 |
0.9%
|
|
| 2010 | 1 |
0.9%
|
|
| 2011 | 2 |
1.8%
|
|
| 2016 | 1 |
0.9%
|
|
| 2017 | 2 |
1.8%
|
|
| 2018 | 3 |
2.7%
|
|
| 2019 | 1 |
0.9%
|
|
| 2020 | 6 |
5.4%
|
|
| 2021 | 5 |
4.5%
|
|
| 2022 | 11 |
9.8%
|
|
| 2023 | 27 |
24.1%
|
|
| 2024 | 43 |
38.4%
|
|
| 2025 | 7 |
6.3%
|
|
| Sysmiss | 147 |