Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 8 |
0.6%
|
1830 | 1 |
0.1%
|
|
1836 | 1 |
0.1%
|
|
1860 | 1 |
0.1%
|
|
1886 | 1 |
0.1%
|
|
1900 | 1 |
0.1%
|
|
1907 | 3 |
0.2%
|
|
1908 | 1 |
0.1%
|
|
1910 | 1 |
0.1%
|
|
1912 | 1 |
0.1%
|
|
1916 | 4 |
0.3%
|
|
1917 | 2 |
0.1%
|
|
1921 | 1 |
0.1%
|
|
1922 | 1 |
0.1%
|
|
1925 | 6 |
0.4%
|
|
1930 | 3 |
0.2%
|
|
1931 | 1 |
0.1%
|
|
1932 | 1 |
0.1%
|
|
1933 | 3 |
0.2%
|
|
1934 | 2 |
0.1%
|
|
1936 | 5 |
0.4%
|
|
1937 | 1 |
0.1%
|
|
1938 | 1 |
0.1%
|
|
1939 | 4 |
0.3%
|
|
1940 | 2 |
0.1%
|
|
1942 | 3 |
0.2%
|
|
1943 | 1 |
0.1%
|
|
1944 | 3 |
0.2%
|
|
1945 | 4 |
0.3%
|
|
1946 | 4 |
0.3%
|
|
1947 | 4 |
0.3%
|
|
1948 | 3 |
0.2%
|
|
1949 | 3 |
0.2%
|
|
1950 | 4 |
0.3%
|
|
1951 | 4 |
0.3%
|
|
1952 | 6 |
0.4%
|
|
1953 | 4 |
0.3%
|
|
1955 | 2 |
0.1%
|
|
1956 | 3 |
0.2%
|
|
1957 | 2 |
0.1%
|
|
1958 | 8 |
0.6%
|
|
1959 | 3 |
0.2%
|
|
1960 | 7 |
0.5%
|
|
1961 | 9 |
0.7%
|
|
1962 | 4 |
0.3%
|
|
1963 | 8 |
0.6%
|
|
1964 | 15 |
1.1%
|
|
1965 | 12 |
0.9%
|
|
1966 | 7 |
0.5%
|
|
1967 | 10 |
0.7%
|
|
1968 | 8 |
0.6%
|
|
1969 | 8 |
0.6%
|
|
1970 | 20 |
1.5%
|
|
1971 | 7 |
0.5%
|
|
1972 | 13 |
1%
|
|
1973 | 12 |
0.9%
|
|
1974 | 18 |
1.3%
|
|
1975 | 12 |
0.9%
|
|
1976 | 24 |
1.8%
|
|
1977 | 17 |
1.3%
|
|
1978 | 24 |
1.8%
|
|
1979 | 14 |
1%
|
|
1980 | 24 |
1.8%
|
|
1981 | 14 |
1%
|
|
1982 | 12 |
0.9%
|
|
1983 | 15 |
1.1%
|
|
1984 | 14 |
1%
|
|
1985 | 49 |
3.7%
|
|
1986 | 40 |
3%
|
|
1987 | 33 |
2.5%
|
|
1988 | 25 |
1.9%
|
|
1989 | 30 |
2.2%
|
|
1990 | 47 |
3.5%
|
|
1991 | 35 |
2.6%
|
|
1992 | 33 |
2.5%
|
|
1993 | 28 |
2.1%
|
|
1994 | 42 |
3.1%
|
|
1995 | 46 |
3.4%
|
|
1996 | 48 |
3.6%
|
|
1997 | 34 |
2.5%
|
|
1998 | 52 |
3.9%
|
|
1999 | 36 |
2.7%
|
|
2000 | 36 |
2.7%
|
|
2001 | 41 |
3.1%
|
|
2002 | 49 |
3.7%
|
|
2003 | 34 |
2.5%
|
|
2004 | 24 |
1.8%
|
|
2005 | 21 |
1.6%
|
|
2006 | 7 |
0.5%
|
|
2007 | 8 |
0.6%
|
|
2008 | 9 |
0.7%
|
|
2009 | 11 |
0.8%
|
|
2010 | 13 |
1%
|
|
2011 | 7 |
0.5%
|
|
2012 | 10 |
0.7%
|
|
2013 | 16 |
1.2%
|
|
2014 | 16 |
1.2%
|
|
2015 | 14 |
1%
|
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