| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
0.8%
|
| -8 | 1 |
0.1%
|
|
| 1910 | 1 |
0.1%
|
|
| 1919 | 1 |
0.1%
|
|
| 1921 | 1 |
0.1%
|
|
| 1926 | 1 |
0.1%
|
|
| 1929 | 1 |
0.1%
|
|
| 1930 | 1 |
0.1%
|
|
| 1933 | 1 |
0.1%
|
|
| 1935 | 2 |
0.1%
|
|
| 1936 | 1 |
0.1%
|
|
| 1937 | 1 |
0.1%
|
|
| 1938 | 7 |
0.4%
|
|
| 1939 | 1 |
0.1%
|
|
| 1940 | 2 |
0.1%
|
|
| 1941 | 1 |
0.1%
|
|
| 1943 | 2 |
0.1%
|
|
| 1946 | 4 |
0.3%
|
|
| 1948 | 2 |
0.1%
|
|
| 1949 | 1 |
0.1%
|
|
| 1950 | 1 |
0.1%
|
|
| 1952 | 4 |
0.3%
|
|
| 1953 | 1 |
0.1%
|
|
| 1954 | 2 |
0.1%
|
|
| 1955 | 4 |
0.3%
|
|
| 1956 | 4 |
0.3%
|
|
| 1957 | 4 |
0.3%
|
|
| 1958 | 3 |
0.2%
|
|
| 1959 | 3 |
0.2%
|
|
| 1960 | 11 |
0.7%
|
|
| 1961 | 5 |
0.3%
|
|
| 1962 | 3 |
0.2%
|
|
| 1963 | 12 |
0.8%
|
|
| 1964 | 12 |
0.8%
|
|
| 1965 | 12 |
0.8%
|
|
| 1966 | 8 |
0.5%
|
|
| 1967 | 7 |
0.4%
|
|
| 1968 | 17 |
1.1%
|
|
| 1969 | 12 |
0.8%
|
|
| 1970 | 25 |
1.6%
|
|
| 1971 | 10 |
0.6%
|
|
| 1972 | 20 |
1.3%
|
|
| 1973 | 22 |
1.4%
|
|
| 1974 | 13 |
0.8%
|
|
| 1975 | 8 |
0.5%
|
|
| 1976 | 31 |
2%
|
|
| 1977 | 18 |
1.1%
|
|
| 1978 | 26 |
1.6%
|
|
| 1979 | 15 |
1%
|
|
| 1980 | 38 |
2.4%
|
|
| 1981 | 23 |
1.5%
|
|
| 1982 | 34 |
2.2%
|
|
| 1983 | 24 |
1.5%
|
|
| 1984 | 21 |
1.3%
|
|
| 1985 | 34 |
2.2%
|
|
| 1986 | 39 |
2.5%
|
|
| 1987 | 33 |
2.1%
|
|
| 1988 | 25 |
1.6%
|
|
| 1989 | 33 |
2.1%
|
|
| 1990 | 84 |
5.3%
|
|
| 1991 | 59 |
3.7%
|
|
| 1992 | 60 |
3.8%
|
|
| 1993 | 62 |
3.9%
|
|
| 1994 | 50 |
3.2%
|
|
| 1995 | 73 |
4.6%
|
|
| 1996 | 63 |
4%
|
|
| 1997 | 65 |
4.1%
|
|
| 1998 | 80 |
5.1%
|
|
| 1999 | 56 |
3.5%
|
|
| 2000 | 67 |
4.2%
|
|
| 2001 | 53 |
3.4%
|
|
| 2002 | 39 |
2.5%
|
|
| 2003 | 14 |
0.9%
|
|
| 2004 | 14 |
0.9%
|
|
| 2005 | 18 |
1.1%
|
|
| 2006 | 8 |
0.5%
|
|
| 2007 | 4 |
0.3%
|
|
| 2008 | 12 |
0.8%
|
|
| 2009 | 8 |
0.5%
|
|
| 2010 | 9 |
0.6%
|
|
| 2011 | 6 |
0.4%
|
|
| 2012 | 1 |
0.1%
|
|
| 2013 | 2 |
0.1%
|
|
| 2014 | 4 |
0.3%
|
|
| 2015 | 5 |
0.3%
|
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