Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 0 |
0%
|
1975 | 1 |
0.6%
|
|
1988 | 1 |
0.6%
|
|
1989 | 1 |
0.6%
|
|
1990 | 1 |
0.6%
|
|
1991 | 2 |
1.1%
|
|
1992 | 1 |
0.6%
|
|
1993 | 1 |
0.6%
|
|
1996 | 2 |
1.1%
|
|
1997 | 3 |
1.7%
|
|
1998 | 3 |
1.7%
|
|
1999 | 5 |
2.9%
|
|
2000 | 5 |
2.9%
|
|
2001 | 6 |
3.4%
|
|
2002 | 5 |
2.9%
|
|
2003 | 6 |
3.4%
|
|
2004 | 9 |
5.1%
|
|
2005 | 6 |
3.4%
|
|
2006 | 10 |
5.7%
|
|
2007 | 7 |
4%
|
|
2008 | 10 |
5.7%
|
|
2009 | 2 |
1.1%
|
|
2010 | 8 |
4.6%
|
|
2011 | 12 |
6.9%
|
|
2012 | 16 |
9.1%
|
|
2013 | 11 |
6.3%
|
|
2014 | 17 |
9.7%
|
|
2015 | 17 |
9.7%
|
|
2016 | 7 |
4%
|
|
Sysmiss | 340 |