| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
5.9%
|
| 1970 | 1 |
2%
|
|
| 1999 | 1 |
2%
|
|
| 2001 | 1 |
2%
|
|
| 2004 | 1 |
2%
|
|
| 2005 | 2 |
3.9%
|
|
| 2006 | 1 |
2%
|
|
| 2007 | 2 |
3.9%
|
|
| 2008 | 1 |
2%
|
|
| 2010 | 2 |
3.9%
|
|
| 2011 | 2 |
3.9%
|
|
| 2013 | 2 |
3.9%
|
|
| 2015 | 4 |
7.8%
|
|
| 2016 | 3 |
5.9%
|
|
| 2017 | 1 |
2%
|
|
| 2018 | 4 |
7.8%
|
|
| 2019 | 5 |
9.8%
|
|
| 2020 | 7 |
13.7%
|
|
| 2021 | 5 |
9.8%
|
|
| 2022 | 2 |
3.9%
|
|
| 2023 | 1 |
2%
|
|
| Sysmiss | 341 |