Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 1 |
0.3%
|
1937 | 1 |
0.3%
|
|
1954 | 1 |
0.3%
|
|
1957 | 1 |
0.3%
|
|
1958 | 1 |
0.3%
|
|
1972 | 1 |
0.3%
|
|
1973 | 3 |
0.8%
|
|
1975 | 1 |
0.3%
|
|
1976 | 2 |
0.6%
|
|
1978 | 1 |
0.3%
|
|
1979 | 2 |
0.6%
|
|
1982 | 2 |
0.6%
|
|
1983 | 2 |
0.6%
|
|
1984 | 1 |
0.3%
|
|
1986 | 1 |
0.3%
|
|
1988 | 1 |
0.3%
|
|
1993 | 1 |
0.3%
|
|
1996 | 2 |
0.6%
|
|
1997 | 1 |
0.3%
|
|
1998 | 7 |
2%
|
|
1999 | 1 |
0.3%
|
|
2000 | 4 |
1.1%
|
|
2002 | 3 |
0.8%
|
|
2003 | 5 |
1.4%
|
|
2004 | 2 |
0.6%
|
|
2005 | 6 |
1.7%
|
|
2006 | 11 |
3.1%
|
|
2007 | 8 |
2.2%
|
|
2008 | 16 |
4.5%
|
|
2009 | 6 |
1.7%
|
|
2010 | 16 |
4.5%
|
|
2011 | 15 |
4.2%
|
|
2012 | 15 |
4.2%
|
|
2013 | 18 |
5%
|
|
2014 | 21 |
5.9%
|
|
2015 | 32 |
8.9%
|
|
2016 | 26 |
7.3%
|
|
2017 | 28 |
7.8%
|
|
2018 | 25 |
7%
|
|
2019 | 18 |
5%
|
|
2020 | 13 |
3.6%
|
|
2021 | 14 |
3.9%
|
|
2022 | 22 |
6.1%
|