| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 20 |
17.4%
|
| 1990 | 1 |
0.9%
|
|
| 1995 | 1 |
0.9%
|
|
| 1996 | 1 |
0.9%
|
|
| 1999 | 1 |
0.9%
|
|
| 2000 | 1 |
0.9%
|
|
| 2003 | 2 |
1.7%
|
|
| 2004 | 2 |
1.7%
|
|
| 2005 | 1 |
0.9%
|
|
| 2008 | 1 |
0.9%
|
|
| 2009 | 1 |
0.9%
|
|
| 2010 | 2 |
1.7%
|
|
| 2011 | 1 |
0.9%
|
|
| 2012 | 4 |
3.5%
|
|
| 2013 | 3 |
2.6%
|
|
| 2014 | 5 |
4.3%
|
|
| 2015 | 15 |
13%
|
|
| 2016 | 8 |
7%
|
|
| 2017 | 9 |
7.8%
|
|
| 2018 | 8 |
7%
|
|
| 2019 | 9 |
7.8%
|
|
| 2020 | 9 |
7.8%
|
|
| 2021 | 8 |
7%
|
|
| 2022 | 2 |
1.7%
|
|
| Sysmiss | 3660 |