Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 1 |
0.2%
|
1887 | 1 |
0.2%
|
|
1928 | 1 |
0.2%
|
|
1956 | 1 |
0.2%
|
|
1965 | 1 |
0.2%
|
|
1969 | 2 |
0.3%
|
|
1970 | 1 |
0.2%
|
|
1987 | 1 |
0.2%
|
|
1988 | 1 |
0.2%
|
|
1989 | 3 |
0.5%
|
|
1990 | 2 |
0.3%
|
|
1991 | 1 |
0.2%
|
|
1992 | 5 |
0.9%
|
|
1993 | 4 |
0.7%
|
|
1994 | 6 |
1%
|
|
1995 | 12 |
2.1%
|
|
1996 | 19 |
3.3%
|
|
1997 | 14 |
2.4%
|
|
1998 | 11 |
1.9%
|
|
1999 | 8 |
1.4%
|
|
2000 | 11 |
1.9%
|
|
2001 | 14 |
2.4%
|
|
2002 | 12 |
2.1%
|
|
2003 | 10 |
1.7%
|
|
2004 | 17 |
2.9%
|
|
2005 | 19 |
3.3%
|
|
2006 | 23 |
4%
|
|
2007 | 23 |
4%
|
|
2008 | 35 |
6%
|
|
2009 | 26 |
4.5%
|
|
2010 | 29 |
5%
|
|
2011 | 33 |
5.7%
|
|
2012 | 37 |
6.4%
|
|
2013 | 31 |
5.3%
|
|
2014 | 29 |
5%
|
|
2015 | 38 |
6.5%
|
|
2016 | 45 |
7.7%
|
|
2017 | 34 |
5.9%
|
|
2018 | 20 |
3.4%
|