| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
4%
|
| 1993 | 1 |
0.4%
|
|
| 2000 | 1 |
0.4%
|
|
| 2005 | 1 |
0.4%
|
|
| 2006 | 2 |
0.8%
|
|
| 2008 | 3 |
1.2%
|
|
| 2010 | 2 |
0.8%
|
|
| 2012 | 6 |
2.4%
|
|
| 2013 | 1 |
0.4%
|
|
| 2014 | 1 |
0.4%
|
|
| 2015 | 1 |
0.4%
|
|
| 2016 | 1 |
0.4%
|
|
| 2017 | 1 |
0.4%
|
|
| 2018 | 4 |
1.6%
|
|
| 2019 | 2 |
0.8%
|
|
| 2020 | 19 |
7.6%
|
|
| 2021 | 25 |
10%
|
|
| 2022 | 80 |
32.1%
|
|
| 2023 | 87 |
34.9%
|
|
| 2024 | 1 |
0.4%
|
|
| Sysmiss | 129 |