Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 2 |
0.2%
|
1846 | 1 |
0.1%
|
|
1922 | 3 |
0.3%
|
|
1923 | 1 |
0.1%
|
|
1925 | 2 |
0.2%
|
|
1940 | 1 |
0.1%
|
|
1948 | 1 |
0.1%
|
|
1953 | 1 |
0.1%
|
|
1962 | 1 |
0.1%
|
|
1963 | 1 |
0.1%
|
|
1967 | 2 |
0.2%
|
|
1968 | 1 |
0.1%
|
|
1970 | 3 |
0.3%
|
|
1971 | 1 |
0.1%
|
|
1972 | 3 |
0.3%
|
|
1973 | 1 |
0.1%
|
|
1974 | 1 |
0.1%
|
|
1979 | 1 |
0.1%
|
|
1980 | 1 |
0.1%
|
|
1981 | 1 |
0.1%
|
|
1982 | 2 |
0.2%
|
|
1983 | 4 |
0.4%
|
|
1985 | 2 |
0.2%
|
|
1986 | 1 |
0.1%
|
|
1987 | 4 |
0.4%
|
|
1988 | 1 |
0.1%
|
|
1989 | 3 |
0.3%
|
|
1990 | 6 |
0.6%
|
|
1991 | 3 |
0.3%
|
|
1992 | 5 |
0.5%
|
|
1993 | 3 |
0.3%
|
|
1994 | 7 |
0.7%
|
|
1995 | 8 |
0.8%
|
|
1996 | 1 |
0.1%
|
|
1997 | 7 |
0.7%
|
|
1998 | 16 |
1.6%
|
|
1999 | 6 |
0.6%
|
|
2000 | 42 |
4.1%
|
|
2001 | 17 |
1.7%
|
|
2002 | 21 |
2%
|
|
2003 | 16 |
1.6%
|
|
2004 | 15 |
1.5%
|
|
2005 | 29 |
2.8%
|
|
2006 | 22 |
2.1%
|
|
2007 | 23 |
2.2%
|
|
2008 | 33 |
3.2%
|
|
2009 | 26 |
2.5%
|
|
2010 | 46 |
4.5%
|
|
2011 | 30 |
2.9%
|
|
2012 | 45 |
4.4%
|
|
2013 | 34 |
3.3%
|
|
2014 | 41 |
4%
|
|
2015 | 65 |
6.3%
|
|
2016 | 58 |
5.7%
|
|
2017 | 58 |
5.7%
|
|
2018 | 86 |
8.4%
|
|
2019 | 70 |
6.8%
|
|
2020 | 64 |
6.2%
|
|
2021 | 29 |
2.8%
|
|
2022 | 39 |
3.8%
|
|
2023 | 8 |
0.8%
|