Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 9 |
0.9%
|
1971 | 1 |
0.1%
|
|
1978 | 1 |
0.1%
|
|
1980 | 2 |
0.2%
|
|
1981 | 1 |
0.1%
|
|
1987 | 1 |
0.1%
|
|
1989 | 1 |
0.1%
|
|
1991 | 2 |
0.2%
|
|
1992 | 1 |
0.1%
|
|
1993 | 2 |
0.2%
|
|
1994 | 3 |
0.3%
|
|
1995 | 2 |
0.2%
|
|
1996 | 5 |
0.5%
|
|
1997 | 4 |
0.4%
|
|
1998 | 4 |
0.4%
|
|
1999 | 8 |
0.8%
|
|
2000 | 23 |
2.3%
|
|
2001 | 6 |
0.6%
|
|
2002 | 7 |
0.7%
|
|
2003 | 8 |
0.8%
|
|
2004 | 7 |
0.7%
|
|
2005 | 5 |
0.5%
|
|
2006 | 21 |
2.1%
|
|
2007 | 14 |
1.4%
|
|
2008 | 19 |
1.9%
|
|
2009 | 14 |
1.4%
|
|
2010 | 61 |
6%
|
|
2011 | 38 |
3.7%
|
|
2012 | 39 |
3.8%
|
|
2013 | 37 |
3.6%
|
|
2014 | 50 |
4.9%
|
|
2015 | 96 |
9.4%
|
|
2016 | 100 |
9.8%
|
|
2017 | 90 |
8.8%
|
|
2018 | 111 |
10.9%
|
|
2019 | 135 |
13.2%
|
|
2020 | 72 |
7.1%
|
|
2021 | 20 |
2%
|