Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 81 |
14.3%
|
1951 | 1 |
0.2%
|
|
1964 | 1 |
0.2%
|
|
1965 | 3 |
0.5%
|
|
1967 | 2 |
0.4%
|
|
1970 | 1 |
0.2%
|
|
1973 | 1 |
0.2%
|
|
1974 | 1 |
0.2%
|
|
1975 | 2 |
0.4%
|
|
1976 | 1 |
0.2%
|
|
1980 | 7 |
1.2%
|
|
1981 | 1 |
0.2%
|
|
1984 | 1 |
0.2%
|
|
1985 | 5 |
0.9%
|
|
1986 | 1 |
0.2%
|
|
1987 | 1 |
0.2%
|
|
1988 | 5 |
0.9%
|
|
1989 | 4 |
0.7%
|
|
1990 | 21 |
3.7%
|
|
1991 | 1 |
0.2%
|
|
1992 | 7 |
1.2%
|
|
1993 | 9 |
1.6%
|
|
1994 | 5 |
0.9%
|
|
1995 | 18 |
3.2%
|
|
1996 | 10 |
1.8%
|
|
1997 | 13 |
2.3%
|
|
1998 | 10 |
1.8%
|
|
1999 | 10 |
1.8%
|
|
2000 | 37 |
6.5%
|
|
2001 | 17 |
3%
|
|
2002 | 9 |
1.6%
|
|
2003 | 23 |
4.1%
|
|
2004 | 9 |
1.6%
|
|
2005 | 30 |
5.3%
|
|
2006 | 5 |
0.9%
|
|
2007 | 15 |
2.6%
|
|
2008 | 27 |
4.8%
|
|
2009 | 17 |
3%
|
|
2010 | 24 |
4.2%
|
|
2011 | 19 |
3.4%
|
|
2012 | 17 |
3%
|
|
2013 | 12 |
2.1%
|
|
2014 | 16 |
2.8%
|
|
2015 | 25 |
4.4%
|
|
2016 | 19 |
3.4%
|
|
2017 | 14 |
2.5%
|
|
2018 | 9 |
1.6%
|
|
Sysmiss | 1096 |