Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 2 |
0.2%
|
1851 | 1 |
0.1%
|
|
1889 | 1 |
0.1%
|
|
1909 | 1 |
0.1%
|
|
1916 | 1 |
0.1%
|
|
1919 | 1 |
0.1%
|
|
1940 | 1 |
0.1%
|
|
1946 | 1 |
0.1%
|
|
1948 | 2 |
0.2%
|
|
1950 | 1 |
0.1%
|
|
1951 | 1 |
0.1%
|
|
1960 | 1 |
0.1%
|
|
1963 | 2 |
0.2%
|
|
1964 | 1 |
0.1%
|
|
1972 | 1 |
0.1%
|
|
1981 | 1 |
0.1%
|
|
1982 | 1 |
0.1%
|
|
1984 | 2 |
0.2%
|
|
1985 | 2 |
0.2%
|
|
1986 | 2 |
0.2%
|
|
1987 | 2 |
0.2%
|
|
1988 | 2 |
0.2%
|
|
1989 | 19 |
2.3%
|
|
1990 | 22 |
2.6%
|
|
1991 | 48 |
5.8%
|
|
1992 | 25 |
3%
|
|
1993 | 32 |
3.9%
|
|
1994 | 22 |
2.6%
|
|
1995 | 33 |
4%
|
|
1996 | 25 |
3%
|
|
1997 | 36 |
4.3%
|
|
1998 | 26 |
3.1%
|
|
1999 | 28 |
3.4%
|
|
2000 | 32 |
3.9%
|
|
2001 | 25 |
3%
|
|
2002 | 29 |
3.5%
|
|
2003 | 24 |
2.9%
|
|
2004 | 12 |
1.4%
|
|
2005 | 26 |
3.1%
|
|
2006 | 27 |
3.2%
|
|
2007 | 16 |
1.9%
|
|
2008 | 25 |
3%
|
|
2009 | 29 |
3.5%
|
|
2010 | 37 |
4.5%
|
|
2011 | 25 |
3%
|
|
2012 | 16 |
1.9%
|
|
2013 | 27 |
3.2%
|
|
2014 | 18 |
2.2%
|
|
2015 | 18 |
2.2%
|
|
2016 | 18 |
2.2%
|
|
2017 | 21 |
2.5%
|
|
2018 | 13 |
1.6%
|
|
2019 | 15 |
1.8%
|
|
2020 | 9 |
1.1%
|
|
2021 | 14 |
1.7%
|
|
2022 | 9 |
1.1%
|