Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 140 |
32.6%
|
1960 | 1 |
0.2%
|
|
1970 | 1 |
0.2%
|
|
1974 | 1 |
0.2%
|
|
1986 | 1 |
0.2%
|
|
1987 | 2 |
0.5%
|
|
1988 | 2 |
0.5%
|
|
1989 | 1 |
0.2%
|
|
1990 | 9 |
2.1%
|
|
1991 | 6 |
1.4%
|
|
1992 | 1 |
0.2%
|
|
1993 | 8 |
1.9%
|
|
1994 | 9 |
2.1%
|
|
1995 | 13 |
3%
|
|
1996 | 4 |
0.9%
|
|
1997 | 4 |
0.9%
|
|
1998 | 9 |
2.1%
|
|
1999 | 11 |
2.6%
|
|
2000 | 19 |
4.4%
|
|
2001 | 6 |
1.4%
|
|
2002 | 15 |
3.5%
|
|
2003 | 6 |
1.4%
|
|
2004 | 9 |
2.1%
|
|
2005 | 28 |
6.5%
|
|
2006 | 6 |
1.4%
|
|
2007 | 5 |
1.2%
|
|
2008 | 12 |
2.8%
|
|
2009 | 14 |
3.3%
|
|
2010 | 24 |
5.6%
|
|
2011 | 12 |
2.8%
|
|
2012 | 8 |
1.9%
|
|
2013 | 4 |
0.9%
|
|
2014 | 9 |
2.1%
|
|
2015 | 9 |
2.1%
|
|
2016 | 7 |
1.6%
|
|
2017 | 10 |
2.3%
|
|
2018 | 3 |
0.7%
|
|
Sysmiss | 940 |