Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 1 |
0.3%
|
1876 | 1 |
0.3%
|
|
1904 | 1 |
0.3%
|
|
1909 | 1 |
0.3%
|
|
1919 | 1 |
0.3%
|
|
1932 | 1 |
0.3%
|
|
1945 | 1 |
0.3%
|
|
1947 | 1 |
0.3%
|
|
1959 | 1 |
0.3%
|
|
1960 | 1 |
0.3%
|
|
1986 | 1 |
0.3%
|
|
1988 | 1 |
0.3%
|
|
1989 | 2 |
0.6%
|
|
1990 | 3 |
0.8%
|
|
1991 | 21 |
5.8%
|
|
1992 | 30 |
8.3%
|
|
1993 | 21 |
5.8%
|
|
1994 | 12 |
3.3%
|
|
1995 | 14 |
3.9%
|
|
1996 | 18 |
5%
|
|
1997 | 18 |
5%
|
|
1998 | 8 |
2.2%
|
|
1999 | 9 |
2.5%
|
|
2000 | 18 |
5%
|
|
2001 | 9 |
2.5%
|
|
2002 | 9 |
2.5%
|
|
2003 | 12 |
3.3%
|
|
2004 | 14 |
3.9%
|
|
2005 | 12 |
3.3%
|
|
2006 | 12 |
3.3%
|
|
2007 | 8 |
2.2%
|
|
2008 | 7 |
1.9%
|
|
2009 | 11 |
3.1%
|
|
2010 | 13 |
3.6%
|
|
2011 | 16 |
4.4%
|
|
2012 | 7 |
1.9%
|
|
2013 | 5 |
1.4%
|
|
2014 | 8 |
2.2%
|
|
2015 | 9 |
2.5%
|
|
2016 | 9 |
2.5%
|
|
2017 | 5 |
1.4%
|
|
2018 | 1 |
0.3%
|
|
2019 | 5 |
1.4%
|
|
2020 | 2 |
0.6%
|