Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 0 |
0%
|
1945 | 1 |
0.1%
|
|
1955 | 1 |
0.1%
|
|
1957 | 1 |
0.1%
|
|
1960 | 2 |
0.2%
|
|
1965 | 1 |
0.1%
|
|
1966 | 1 |
0.1%
|
|
1967 | 1 |
0.1%
|
|
1972 | 1 |
0.1%
|
|
1975 | 2 |
0.2%
|
|
1976 | 2 |
0.2%
|
|
1980 | 1 |
0.1%
|
|
1990 | 3 |
0.3%
|
|
1991 | 1 |
0.1%
|
|
1992 | 3 |
0.3%
|
|
1993 | 8 |
0.8%
|
|
1994 | 7 |
0.7%
|
|
1995 | 6 |
0.6%
|
|
1996 | 5 |
0.5%
|
|
1997 | 5 |
0.5%
|
|
1998 | 12 |
1.2%
|
|
1999 | 14 |
1.4%
|
|
2000 | 24 |
2.3%
|
|
2001 | 40 |
3.9%
|
|
2002 | 32 |
3.1%
|
|
2003 | 42 |
4.1%
|
|
2004 | 44 |
4.3%
|
|
2005 | 46 |
4.5%
|
|
2006 | 54 |
5.3%
|
|
2007 | 49 |
4.8%
|
|
2008 | 67 |
6.5%
|
|
2009 | 52 |
5.1%
|
|
2010 | 60 |
5.8%
|
|
2011 | 54 |
5.3%
|
|
2012 | 29 |
2.8%
|
|
2013 | 29 |
2.8%
|
|
2014 | 37 |
3.6%
|
|
2015 | 62 |
6%
|
|
2016 | 54 |
5.3%
|
|
2017 | 60 |
5.8%
|
|
2018 | 46 |
4.5%
|
|
2019 | 38 |
3.7%
|
|
2020 | 28 |
2.7%
|
|
2021 | 1 |
0.1%
|
|
2022 | 2 |
0.2%
|