| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 57 |
37.3%
|
| 1985 | 1 |
0.7%
|
|
| 1997 | 1 |
0.7%
|
|
| 1998 | 2 |
1.3%
|
|
| 2000 | 1 |
0.7%
|
|
| 2001 | 1 |
0.7%
|
|
| 2003 | 1 |
0.7%
|
|
| 2005 | 1 |
0.7%
|
|
| 2006 | 1 |
0.7%
|
|
| 2007 | 1 |
0.7%
|
|
| 2008 | 7 |
4.6%
|
|
| 2009 | 2 |
1.3%
|
|
| 2010 | 2 |
1.3%
|
|
| 2011 | 4 |
2.6%
|
|
| 2012 | 7 |
4.6%
|
|
| 2013 | 2 |
1.3%
|
|
| 2014 | 3 |
2%
|
|
| 2015 | 9 |
5.9%
|
|
| 2016 | 5 |
3.3%
|
|
| 2017 | 5 |
3.3%
|
|
| 2018 | 12 |
7.8%
|
|
| 2019 | 9 |
5.9%
|
|
| 2020 | 5 |
3.3%
|
|
| 2021 | 9 |
5.9%
|
|
| 2022 | 5 |
3.3%
|
|
| Sysmiss | 560 |