Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 2 |
0.4%
|
-7 | Less than one month | 3 |
0.6%
|
1965 | 1 |
0.2%
|
|
1970 | 1 |
0.2%
|
|
1977 | 1 |
0.2%
|
|
1983 | 1 |
0.2%
|
|
1985 | 1 |
0.2%
|
|
1987 | 2 |
0.4%
|
|
1988 | 1 |
0.2%
|
|
1989 | 1 |
0.2%
|
|
1990 | 2 |
0.4%
|
|
1991 | 1 |
0.2%
|
|
1992 | 7 |
1.4%
|
|
1993 | 1 |
0.2%
|
|
1994 | 1 |
0.2%
|
|
1995 | 1 |
0.2%
|
|
1996 | 2 |
0.4%
|
|
1997 | 6 |
1.2%
|
|
1998 | 2 |
0.4%
|
|
1999 | 5 |
1%
|
|
2000 | 8 |
1.6%
|
|
2001 | 4 |
0.8%
|
|
2002 | 5 |
1%
|
|
2003 | 4 |
0.8%
|
|
2004 | 6 |
1.2%
|
|
2005 | 5 |
1%
|
|
2006 | 7 |
1.4%
|
|
2007 | 13 |
2.5%
|
|
2008 | 21 |
4.1%
|
|
2009 | 11 |
2.1%
|
|
2010 | 30 |
5.8%
|
|
2011 | 29 |
5.6%
|
|
2012 | 26 |
5%
|
|
2013 | 39 |
7.6%
|
|
2014 | 58 |
11.3%
|
|
2015 | 79 |
15.3%
|
|
2016 | 103 |
20%
|
|
2017 | 25 |
4.9%
|