Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 17 |
1.3%
|
1817 | 1 |
0.1%
|
|
1913 | 1 |
0.1%
|
|
1919 | 1 |
0.1%
|
|
1929 | 2 |
0.2%
|
|
1936 | 2 |
0.2%
|
|
1944 | 2 |
0.2%
|
|
1945 | 2 |
0.2%
|
|
1946 | 1 |
0.1%
|
|
1952 | 2 |
0.2%
|
|
1954 | 2 |
0.2%
|
|
1957 | 2 |
0.2%
|
|
1958 | 1 |
0.1%
|
|
1962 | 1 |
0.1%
|
|
1965 | 1 |
0.1%
|
|
1967 | 2 |
0.2%
|
|
1970 | 1 |
0.1%
|
|
1973 | 2 |
0.2%
|
|
1974 | 2 |
0.2%
|
|
1975 | 1 |
0.1%
|
|
1976 | 1 |
0.1%
|
|
1981 | 1 |
0.1%
|
|
1982 | 1 |
0.1%
|
|
1986 | 2 |
0.2%
|
|
1990 | 1 |
0.1%
|
|
1991 | 9 |
0.7%
|
|
1992 | 28 |
2.1%
|
|
1993 | 33 |
2.5%
|
|
1994 | 11 |
0.8%
|
|
1995 | 14 |
1.1%
|
|
1996 | 16 |
1.2%
|
|
1997 | 21 |
1.6%
|
|
1998 | 23 |
1.7%
|
|
1999 | 33 |
2.5%
|
|
2000 | 34 |
2.6%
|
|
2001 | 29 |
2.2%
|
|
2002 | 133 |
10.1%
|
|
2003 | 85 |
6.4%
|
|
2004 | 58 |
4.4%
|
|
2005 | 58 |
4.4%
|
|
2006 | 68 |
5.1%
|
|
2007 | 70 |
5.3%
|
|
2008 | 65 |
4.9%
|
|
2009 | 49 |
3.7%
|
|
2010 | 45 |
3.4%
|
|
2011 | 58 |
4.4%
|
|
2012 | 62 |
4.7%
|
|
2013 | 52 |
3.9%
|
|
2014 | 57 |
4.3%
|
|
2015 | 64 |
4.8%
|
|
2016 | 54 |
4.1%
|
|
2017 | 42 |
3.2%
|