Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 21 |
1.5%
|
1936 | 1 |
0.1%
|
|
1937 | 1 |
0.1%
|
|
1941 | 2 |
0.1%
|
|
1942 | 1 |
0.1%
|
|
1954 | 2 |
0.1%
|
|
1956 | 1 |
0.1%
|
|
1958 | 1 |
0.1%
|
|
1960 | 1 |
0.1%
|
|
1964 | 1 |
0.1%
|
|
1965 | 1 |
0.1%
|
|
1966 | 3 |
0.2%
|
|
1967 | 2 |
0.1%
|
|
1968 | 1 |
0.1%
|
|
1969 | 2 |
0.1%
|
|
1974 | 1 |
0.1%
|
|
1975 | 1 |
0.1%
|
|
1982 | 1 |
0.1%
|
|
1985 | 2 |
0.1%
|
|
1987 | 2 |
0.1%
|
|
1989 | 3 |
0.2%
|
|
1990 | 1 |
0.1%
|
|
1991 | 12 |
0.8%
|
|
1992 | 16 |
1.1%
|
|
1993 | 19 |
1.3%
|
|
1994 | 12 |
0.8%
|
|
1995 | 16 |
1.1%
|
|
1996 | 18 |
1.2%
|
|
1997 | 15 |
1%
|
|
1998 | 30 |
2.1%
|
|
1999 | 34 |
2.4%
|
|
2000 | 51 |
3.5%
|
|
2001 | 41 |
2.8%
|
|
2002 | 50 |
3.5%
|
|
2003 | 52 |
3.6%
|
|
2004 | 48 |
3.3%
|
|
2005 | 63 |
4.4%
|
|
2006 | 59 |
4.1%
|
|
2007 | 59 |
4.1%
|
|
2008 | 59 |
4.1%
|
|
2009 | 77 |
5.3%
|
|
2010 | 94 |
6.5%
|
|
2011 | 64 |
4.4%
|
|
2012 | 75 |
5.2%
|
|
2013 | 75 |
5.2%
|
|
2014 | 87 |
6%
|
|
2015 | 80 |
5.5%
|
|
2016 | 89 |
6.2%
|
|
2017 | 99 |
6.8%
|