Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 3 |
0.2%
|
1890 | 2 |
0.1%
|
|
1892 | 1 |
0.1%
|
|
1900 | 2 |
0.1%
|
|
1902 | 1 |
0.1%
|
|
1904 | 1 |
0.1%
|
|
1906 | 1 |
0.1%
|
|
1915 | 1 |
0.1%
|
|
1916 | 1 |
0.1%
|
|
1920 | 2 |
0.1%
|
|
1921 | 2 |
0.1%
|
|
1923 | 1 |
0.1%
|
|
1924 | 1 |
0.1%
|
|
1925 | 2 |
0.1%
|
|
1926 | 5 |
0.3%
|
|
1928 | 1 |
0.1%
|
|
1930 | 3 |
0.2%
|
|
1931 | 4 |
0.3%
|
|
1933 | 2 |
0.1%
|
|
1935 | 2 |
0.1%
|
|
1938 | 1 |
0.1%
|
|
1940 | 3 |
0.2%
|
|
1942 | 6 |
0.4%
|
|
1944 | 1 |
0.1%
|
|
1945 | 5 |
0.3%
|
|
1946 | 5 |
0.3%
|
|
1947 | 2 |
0.1%
|
|
1948 | 4 |
0.3%
|
|
1949 | 3 |
0.2%
|
|
1950 | 5 |
0.3%
|
|
1951 | 2 |
0.1%
|
|
1952 | 4 |
0.3%
|
|
1953 | 4 |
0.3%
|
|
1954 | 7 |
0.4%
|
|
1955 | 15 |
0.9%
|
|
1956 | 11 |
0.7%
|
|
1957 | 3 |
0.2%
|
|
1958 | 7 |
0.4%
|
|
1959 | 6 |
0.4%
|
|
1960 | 20 |
1.3%
|
|
1961 | 8 |
0.5%
|
|
1962 | 8 |
0.5%
|
|
1963 | 13 |
0.8%
|
|
1964 | 9 |
0.6%
|
|
1965 | 16 |
1%
|
|
1966 | 12 |
0.8%
|
|
1967 | 13 |
0.8%
|
|
1968 | 8 |
0.5%
|
|
1969 | 7 |
0.4%
|
|
1970 | 21 |
1.3%
|
|
1971 | 11 |
0.7%
|
|
1972 | 31 |
1.9%
|
|
1973 | 29 |
1.8%
|
|
1974 | 26 |
1.6%
|
|
1975 | 22 |
1.4%
|
|
1976 | 19 |
1.2%
|
|
1977 | 10 |
0.6%
|
|
1978 | 17 |
1.1%
|
|
1979 | 10 |
0.6%
|
|
1980 | 48 |
3%
|
|
1981 | 13 |
0.8%
|
|
1982 | 21 |
1.3%
|
|
1983 | 21 |
1.3%
|
|
1984 | 27 |
1.7%
|
|
1985 | 34 |
2.1%
|
|
1986 | 22 |
1.4%
|
|
1987 | 25 |
1.6%
|
|
1988 | 31 |
1.9%
|
|
1989 | 24 |
1.5%
|
|
1990 | 78 |
4.9%
|
|
1991 | 81 |
5.1%
|
|
1992 | 59 |
3.7%
|
|
1993 | 46 |
2.9%
|
|
1994 | 44 |
2.8%
|
|
1995 | 74 |
4.6%
|
|
1996 | 60 |
3.8%
|
|
1997 | 85 |
5.3%
|
|
1998 | 73 |
4.6%
|
|
1999 | 55 |
3.4%
|
|
2000 | 72 |
4.5%
|
|
2001 | 33 |
2.1%
|
|
2002 | 30 |
1.9%
|
|
2003 | 13 |
0.8%
|
|
2004 | 14 |
0.9%
|
|
2005 | 17 |
1.1%
|
|
2006 | 4 |
0.3%
|
|
2007 | 10 |
0.6%
|
|
2008 | 13 |
0.8%
|
|
2009 | 12 |
0.8%
|
|
2010 | 9 |
0.6%
|
|
2011 | 4 |
0.3%
|
|
2012 | 2 |
0.1%
|
|
2013 | 3 |
0.2%
|
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