| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
13.4%
|
| 1971 | 1 |
1%
|
|
| 1975 | 1 |
1%
|
|
| 1976 | 1 |
1%
|
|
| 1977 | 1 |
1%
|
|
| 1978 | 1 |
1%
|
|
| 1980 | 4 |
4.1%
|
|
| 1982 | 1 |
1%
|
|
| 1986 | 2 |
2.1%
|
|
| 1988 | 1 |
1%
|
|
| 1990 | 3 |
3.1%
|
|
| 1992 | 1 |
1%
|
|
| 1993 | 1 |
1%
|
|
| 1994 | 1 |
1%
|
|
| 1995 | 3 |
3.1%
|
|
| 1997 | 2 |
2.1%
|
|
| 1998 | 3 |
3.1%
|
|
| 2000 | 3 |
3.1%
|
|
| 2001 | 1 |
1%
|
|
| 2002 | 3 |
3.1%
|
|
| 2003 | 4 |
4.1%
|
|
| 2004 | 1 |
1%
|
|
| 2005 | 6 |
6.2%
|
|
| 2006 | 5 |
5.2%
|
|
| 2007 | 2 |
2.1%
|
|
| 2008 | 1 |
1%
|
|
| 2009 | 2 |
2.1%
|
|
| 2010 | 5 |
5.2%
|
|
| 2011 | 1 |
1%
|
|
| 2012 | 2 |
2.1%
|
|
| 2013 | 1 |
1%
|
|
| 2014 | 2 |
2.1%
|
|
| 2016 | 3 |
3.1%
|
|
| 2017 | 5 |
5.2%
|
|
| 2018 | 2 |
2.1%
|
|
| 2019 | 1 |
1%
|
|
| 2020 | 2 |
2.1%
|
|
| 2021 | 2 |
2.1%
|
|
| 2022 | 3 |
3.1%
|
|
| Sysmiss | 256 |