| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
6.6%
|
| 1982 | 1 |
1.3%
|
|
| 1983 | 1 |
1.3%
|
|
| 1986 | 1 |
1.3%
|
|
| 1988 | 1 |
1.3%
|
|
| 1990 | 1 |
1.3%
|
|
| 1992 | 1 |
1.3%
|
|
| 1993 | 1 |
1.3%
|
|
| 1994 | 2 |
2.6%
|
|
| 1995 | 1 |
1.3%
|
|
| 1996 | 1 |
1.3%
|
|
| 1997 | 1 |
1.3%
|
|
| 1998 | 1 |
1.3%
|
|
| 1999 | 1 |
1.3%
|
|
| 2000 | 4 |
5.3%
|
|
| 2002 | 2 |
2.6%
|
|
| 2003 | 2 |
2.6%
|
|
| 2004 | 1 |
1.3%
|
|
| 2005 | 3 |
3.9%
|
|
| 2007 | 2 |
2.6%
|
|
| 2008 | 2 |
2.6%
|
|
| 2009 | 1 |
1.3%
|
|
| 2010 | 6 |
7.9%
|
|
| 2011 | 1 |
1.3%
|
|
| 2012 | 2 |
2.6%
|
|
| 2013 | 2 |
2.6%
|
|
| 2015 | 5 |
6.6%
|
|
| 2016 | 1 |
1.3%
|
|
| 2018 | 5 |
6.6%
|
|
| 2019 | 2 |
2.6%
|
|
| 2020 | 5 |
6.6%
|
|
| 2021 | 4 |
5.3%
|
|
| 2022 | 6 |
7.9%
|
|
| 2023 | 1 |
1.3%
|
|
| Sysmiss | 527 |