| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 |
3.2%
|
| 2000 | 1 |
0.3%
|
|
| 2006 | 1 |
0.3%
|
|
| 2008 | 1 |
0.3%
|
|
| 2010 | 2 |
0.6%
|
|
| 2011 | 1 |
0.3%
|
|
| 2012 | 1 |
0.3%
|
|
| 2015 | 1 |
0.3%
|
|
| 2017 | 2 |
0.6%
|
|
| 2018 | 7 |
2.1%
|
|
| 2019 | 16 |
4.7%
|
|
| 2020 | 32 |
9.4%
|
|
| 2021 | 50 |
14.7%
|
|
| 2022 | 89 |
26.1%
|
|
| 2023 | 84 |
24.6%
|
|
| 2024 | 42 |
12.3%
|
|
| Sysmiss | 274 |