Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 39 |
2.8%
|
1890 | 2 |
0.1%
|
|
1900 | 1 |
0.1%
|
|
1908 | 1 |
0.1%
|
|
1910 | 1 |
0.1%
|
|
1917 | 1 |
0.1%
|
|
1918 | 1 |
0.1%
|
|
1920 | 1 |
0.1%
|
|
1927 | 1 |
0.1%
|
|
1928 | 2 |
0.1%
|
|
1945 | 1 |
0.1%
|
|
1946 | 2 |
0.1%
|
|
1947 | 3 |
0.2%
|
|
1948 | 1 |
0.1%
|
|
1950 | 1 |
0.1%
|
|
1951 | 1 |
0.1%
|
|
1952 | 2 |
0.1%
|
|
1953 | 2 |
0.1%
|
|
1956 | 1 |
0.1%
|
|
1960 | 2 |
0.1%
|
|
1966 | 1 |
0.1%
|
|
1967 | 1 |
0.1%
|
|
1968 | 2 |
0.1%
|
|
1969 | 1 |
0.1%
|
|
1970 | 1 |
0.1%
|
|
1971 | 2 |
0.1%
|
|
1972 | 1 |
0.1%
|
|
1974 | 4 |
0.3%
|
|
1975 | 3 |
0.2%
|
|
1976 | 4 |
0.3%
|
|
1979 | 5 |
0.4%
|
|
1980 | 7 |
0.5%
|
|
1981 | 5 |
0.4%
|
|
1982 | 10 |
0.7%
|
|
1983 | 10 |
0.7%
|
|
1984 | 11 |
0.8%
|
|
1985 | 14 |
1%
|
|
1986 | 13 |
0.9%
|
|
1987 | 12 |
0.9%
|
|
1988 | 13 |
0.9%
|
|
1989 | 43 |
3.1%
|
|
1990 | 53 |
3.9%
|
|
1991 | 58 |
4.2%
|
|
1992 | 54 |
3.9%
|
|
1993 | 40 |
2.9%
|
|
1994 | 37 |
2.7%
|
|
1995 | 46 |
3.4%
|
|
1996 | 43 |
3.1%
|
|
1997 | 40 |
2.9%
|
|
1998 | 42 |
3.1%
|
|
1999 | 43 |
3.1%
|
|
2000 | 65 |
4.7%
|
|
2001 | 75 |
5.5%
|
|
2002 | 65 |
4.7%
|
|
2003 | 47 |
3.4%
|
|
2004 | 38 |
2.8%
|
|
2005 | 64 |
4.7%
|
|
2006 | 27 |
2%
|
|
2007 | 20 |
1.5%
|
|
2008 | 22 |
1.6%
|
|
2009 | 37 |
2.7%
|
|
2010 | 48 |
3.5%
|
|
2011 | 26 |
1.9%
|
|
2012 | 32 |
2.3%
|
|
2013 | 14 |
1%
|
|
2014 | 25 |
1.8%
|
|
2015 | 22 |
1.6%
|
|
2016 | 21 |
1.5%
|
|
2017 | 36 |
2.6%
|