| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 |
6.5%
|
| 1990 | 1 |
0.5%
|
|
| 2000 | 1 |
0.5%
|
|
| 2003 | 1 |
0.5%
|
|
| 2005 | 1 |
0.5%
|
|
| 2008 | 4 |
2.2%
|
|
| 2010 | 3 |
1.6%
|
|
| 2012 | 1 |
0.5%
|
|
| 2013 | 1 |
0.5%
|
|
| 2014 | 1 |
0.5%
|
|
| 2015 | 5 |
2.7%
|
|
| 2016 | 1 |
0.5%
|
|
| 2017 | 5 |
2.7%
|
|
| 2018 | 10 |
5.4%
|
|
| 2019 | 12 |
6.5%
|
|
| 2020 | 18 |
9.8%
|
|
| 2021 | 19 |
10.3%
|
|
| 2022 | 61 |
33.2%
|
|
| 2023 | 27 |
14.7%
|
|
| Sysmiss | 173 |