| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 18 |
4.1%
|
| 1990 | 1 |
0.2%
|
|
| 1999 | 1 |
0.2%
|
|
| 2000 | 2 |
0.5%
|
|
| 2001 | 1 |
0.2%
|
|
| 2003 | 1 |
0.2%
|
|
| 2007 | 1 |
0.2%
|
|
| 2009 | 1 |
0.2%
|
|
| 2010 | 5 |
1.2%
|
|
| 2012 | 2 |
0.5%
|
|
| 2013 | 1 |
0.2%
|
|
| 2015 | 6 |
1.4%
|
|
| 2016 | 2 |
0.5%
|
|
| 2017 | 11 |
2.5%
|
|
| 2018 | 29 |
6.7%
|
|
| 2019 | 37 |
8.5%
|
|
| 2020 | 51 |
11.8%
|
|
| 2021 | 97 |
22.4%
|
|
| 2022 | 138 |
31.8%
|
|
| 2023 | 29 |
6.7%
|
|
| Sysmiss | 295 |