Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 40 |
14.7%
|
1927 | 1 |
0.4%
|
|
1956 | 1 |
0.4%
|
|
1965 | 2 |
0.7%
|
|
1971 | 1 |
0.4%
|
|
1975 | 1 |
0.4%
|
|
1977 | 1 |
0.4%
|
|
1980 | 1 |
0.4%
|
|
1989 | 3 |
1.1%
|
|
1990 | 1 |
0.4%
|
|
1991 | 1 |
0.4%
|
|
1992 | 7 |
2.6%
|
|
1993 | 2 |
0.7%
|
|
1994 | 3 |
1.1%
|
|
1995 | 8 |
2.9%
|
|
1996 | 2 |
0.7%
|
|
1997 | 7 |
2.6%
|
|
1998 | 2 |
0.7%
|
|
1999 | 9 |
3.3%
|
|
2000 | 15 |
5.5%
|
|
2001 | 6 |
2.2%
|
|
2002 | 6 |
2.2%
|
|
2003 | 6 |
2.2%
|
|
2004 | 6 |
2.2%
|
|
2005 | 9 |
3.3%
|
|
2006 | 5 |
1.8%
|
|
2007 | 10 |
3.7%
|
|
2008 | 13 |
4.8%
|
|
2009 | 13 |
4.8%
|
|
2010 | 23 |
8.5%
|
|
2011 | 11 |
4%
|
|
2012 | 11 |
4%
|
|
2013 | 13 |
4.8%
|
|
2014 | 11 |
4%
|
|
2015 | 10 |
3.7%
|
|
2016 | 6 |
2.2%
|
|
2017 | 3 |
1.1%
|
|
2018 | 2 |
0.7%
|
|
Sysmiss | 500 |