| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
1.7%
|
| 2005 | 1 |
0.3%
|
|
| 2006 | 2 |
0.7%
|
|
| 2008 | 1 |
0.3%
|
|
| 2009 | 1 |
0.3%
|
|
| 2010 | 3 |
1%
|
|
| 2013 | 1 |
0.3%
|
|
| 2014 | 1 |
0.3%
|
|
| 2015 | 6 |
2.1%
|
|
| 2016 | 8 |
2.8%
|
|
| 2017 | 6 |
2.1%
|
|
| 2018 | 26 |
9.1%
|
|
| 2019 | 33 |
11.5%
|
|
| 2020 | 32 |
11.1%
|
|
| 2021 | 35 |
12.2%
|
|
| 2022 | 93 |
32.4%
|
|
| 2023 | 33 |
11.5%
|
|
| Sysmiss | 423 |