Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 16 |
1.3%
|
1868 | 1 |
0.1%
|
|
1906 | 1 |
0.1%
|
|
1913 | 2 |
0.2%
|
|
1922 | 1 |
0.1%
|
|
1932 | 1 |
0.1%
|
|
1933 | 1 |
0.1%
|
|
1936 | 1 |
0.1%
|
|
1938 | 3 |
0.2%
|
|
1941 | 1 |
0.1%
|
|
1942 | 4 |
0.3%
|
|
1947 | 1 |
0.1%
|
|
1950 | 1 |
0.1%
|
|
1955 | 1 |
0.1%
|
|
1957 | 2 |
0.2%
|
|
1958 | 1 |
0.1%
|
|
1959 | 2 |
0.2%
|
|
1963 | 1 |
0.1%
|
|
1966 | 1 |
0.1%
|
|
1967 | 1 |
0.1%
|
|
1969 | 1 |
0.1%
|
|
1972 | 1 |
0.1%
|
|
1975 | 5 |
0.4%
|
|
1976 | 1 |
0.1%
|
|
1978 | 1 |
0.1%
|
|
1979 | 2 |
0.2%
|
|
1980 | 3 |
0.2%
|
|
1981 | 1 |
0.1%
|
|
1983 | 1 |
0.1%
|
|
1984 | 2 |
0.2%
|
|
1985 | 1 |
0.1%
|
|
1987 | 2 |
0.2%
|
|
1989 | 1 |
0.1%
|
|
1990 | 4 |
0.3%
|
|
1991 | 9 |
0.7%
|
|
1992 | 9 |
0.7%
|
|
1993 | 12 |
1%
|
|
1994 | 24 |
1.9%
|
|
1995 | 18 |
1.5%
|
|
1996 | 33 |
2.7%
|
|
1997 | 19 |
1.5%
|
|
1998 | 11 |
0.9%
|
|
1999 | 12 |
1%
|
|
2000 | 24 |
1.9%
|
|
2001 | 25 |
2%
|
|
2002 | 27 |
2.2%
|
|
2003 | 47 |
3.8%
|
|
2004 | 38 |
3.1%
|
|
2005 | 41 |
3.3%
|
|
2006 | 33 |
2.7%
|
|
2007 | 49 |
4%
|
|
2008 | 49 |
4%
|
|
2009 | 76 |
6.1%
|
|
2010 | 79 |
6.4%
|
|
2011 | 60 |
4.8%
|
|
2012 | 62 |
5%
|
|
2013 | 67 |
5.4%
|
|
2014 | 63 |
5.1%
|
|
2015 | 77 |
6.2%
|
|
2016 | 82 |
6.6%
|
|
2017 | 124 |
10%
|