| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 30 |
5.3%
|
| 2000 | 1 |
0.2%
|
|
| 2002 | 1 |
0.2%
|
|
| 2005 | 1 |
0.2%
|
|
| 2007 | 1 |
0.2%
|
|
| 2008 | 1 |
0.2%
|
|
| 2009 | 2 |
0.4%
|
|
| 2010 | 4 |
0.7%
|
|
| 2011 | 1 |
0.2%
|
|
| 2012 | 2 |
0.4%
|
|
| 2013 | 6 |
1.1%
|
|
| 2014 | 2 |
0.4%
|
|
| 2015 | 4 |
0.7%
|
|
| 2016 | 4 |
0.7%
|
|
| 2017 | 8 |
1.4%
|
|
| 2018 | 18 |
3.2%
|
|
| 2019 | 25 |
4.4%
|
|
| 2020 | 57 |
10%
|
|
| 2021 | 91 |
16%
|
|
| 2022 | 239 |
41.9%
|
|
| 2023 | 72 |
12.6%
|
|
| Sysmiss | 280 |