Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 6 |
1.7%
|
1952 | 1 |
0.3%
|
|
1959 | 1 |
0.3%
|
|
1961 | 1 |
0.3%
|
|
1989 | 1 |
0.3%
|
|
1990 | 2 |
0.6%
|
|
1991 | 21 |
5.8%
|
|
1992 | 23 |
6.4%
|
|
1993 | 32 |
8.9%
|
|
1994 | 21 |
5.8%
|
|
1995 | 16 |
4.5%
|
|
1996 | 10 |
2.8%
|
|
1997 | 15 |
4.2%
|
|
1998 | 13 |
3.6%
|
|
1999 | 11 |
3.1%
|
|
2000 | 15 |
4.2%
|
|
2001 | 14 |
3.9%
|
|
2002 | 9 |
2.5%
|
|
2003 | 19 |
5.3%
|
|
2004 | 10 |
2.8%
|
|
2005 | 19 |
5.3%
|
|
2006 | 11 |
3.1%
|
|
2007 | 10 |
2.8%
|
|
2008 | 11 |
3.1%
|
|
2009 | 9 |
2.5%
|
|
2010 | 11 |
3.1%
|
|
2011 | 8 |
2.2%
|
|
2012 | 8 |
2.2%
|
|
2013 | 11 |
3.1%
|
|
2014 | 4 |
1.1%
|
|
2015 | 8 |
2.2%
|
|
2016 | 7 |
1.9%
|
|
2017 | 1 |
0.3%
|