Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 1 |
0.1%
|
1939 | 1 |
0.1%
|
|
1965 | 1 |
0.1%
|
|
1970 | 1 |
0.1%
|
|
1972 | 1 |
0.1%
|
|
1976 | 1 |
0.1%
|
|
1977 | 2 |
0.2%
|
|
1990 | 1 |
0.1%
|
|
1991 | 35 |
3.6%
|
|
1992 | 69 |
7.1%
|
|
1993 | 64 |
6.6%
|
|
1994 | 71 |
7.3%
|
|
1995 | 23 |
2.4%
|
|
1996 | 23 |
2.4%
|
|
1997 | 18 |
1.9%
|
|
1998 | 25 |
2.6%
|
|
1999 | 30 |
3.1%
|
|
2000 | 23 |
2.4%
|
|
2001 | 14 |
1.4%
|
|
2002 | 37 |
3.8%
|
|
2003 | 45 |
4.7%
|
|
2004 | 34 |
3.5%
|
|
2005 | 49 |
5.1%
|
|
2006 | 30 |
3.1%
|
|
2007 | 25 |
2.6%
|
|
2008 | 32 |
3.3%
|
|
2009 | 22 |
2.3%
|
|
2010 | 26 |
2.7%
|
|
2011 | 35 |
3.6%
|
|
2012 | 31 |
3.2%
|
|
2013 | 30 |
3.1%
|
|
2014 | 29 |
3%
|
|
2015 | 21 |
2.2%
|
|
2016 | 30 |
3.1%
|
|
2017 | 27 |
2.8%
|
|
2018 | 23 |
2.4%
|
|
2019 | 21 |
2.2%
|
|
2020 | 7 |
0.7%
|
|
2021 | 8 |
0.8%
|