Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 166 |
5.6%
|
1882 | 1 |
0%
|
|
1885 | 1 |
0%
|
|
1908 | 1 |
0%
|
|
1910 | 2 |
0.1%
|
|
1912 | 1 |
0%
|
|
1920 | 1 |
0%
|
|
1922 | 1 |
0%
|
|
1924 | 2 |
0.1%
|
|
1926 | 1 |
0%
|
|
1930 | 1 |
0%
|
|
1931 | 1 |
0%
|
|
1936 | 1 |
0%
|
|
1940 | 1 |
0%
|
|
1941 | 1 |
0%
|
|
1945 | 1 |
0%
|
|
1947 | 1 |
0%
|
|
1948 | 1 |
0%
|
|
1950 | 4 |
0.1%
|
|
1951 | 1 |
0%
|
|
1952 | 2 |
0.1%
|
|
1953 | 1 |
0%
|
|
1955 | 1 |
0%
|
|
1956 | 1 |
0%
|
|
1957 | 1 |
0%
|
|
1958 | 1 |
0%
|
|
1959 | 2 |
0.1%
|
|
1960 | 5 |
0.2%
|
|
1962 | 1 |
0%
|
|
1963 | 1 |
0%
|
|
1964 | 1 |
0%
|
|
1965 | 3 |
0.1%
|
|
1966 | 2 |
0.1%
|
|
1967 | 7 |
0.2%
|
|
1968 | 2 |
0.1%
|
|
1969 | 1 |
0%
|
|
1970 | 11 |
0.4%
|
|
1971 | 6 |
0.2%
|
|
1972 | 6 |
0.2%
|
|
1973 | 3 |
0.1%
|
|
1974 | 6 |
0.2%
|
|
1975 | 13 |
0.4%
|
|
1976 | 10 |
0.3%
|
|
1977 | 6 |
0.2%
|
|
1978 | 3 |
0.1%
|
|
1979 | 4 |
0.1%
|
|
1980 | 30 |
1%
|
|
1981 | 2 |
0.1%
|
|
1982 | 9 |
0.3%
|
|
1983 | 14 |
0.5%
|
|
1984 | 9 |
0.3%
|
|
1985 | 18 |
0.6%
|
|
1986 | 12 |
0.4%
|
|
1987 | 9 |
0.3%
|
|
1988 | 21 |
0.7%
|
|
1989 | 17 |
0.6%
|
|
1990 | 63 |
2.1%
|
|
1991 | 13 |
0.4%
|
|
1992 | 29 |
1%
|
|
1993 | 25 |
0.8%
|
|
1994 | 32 |
1.1%
|
|
1995 | 60 |
2%
|
|
1996 | 40 |
1.4%
|
|
1997 | 43 |
1.5%
|
|
1998 | 44 |
1.5%
|
|
1999 | 51 |
1.7%
|
|
2000 | 217 |
7.3%
|
|
2001 | 49 |
1.7%
|
|
2002 | 82 |
2.8%
|
|
2003 | 56 |
1.9%
|
|
2004 | 55 |
1.9%
|
|
2005 | 103 |
3.5%
|
|
2006 | 49 |
1.7%
|
|
2007 | 69 |
2.3%
|
|
2008 | 109 |
3.7%
|
|
2009 | 94 |
3.2%
|
|
2010 | 245 |
8.3%
|
|
2011 | 63 |
2.1%
|
|
2012 | 131 |
4.4%
|
|
2013 | 113 |
3.8%
|
|
2014 | 120 |
4.1%
|
|
2015 | 184 |
6.2%
|
|
2016 | 114 |
3.9%
|
|
2017 | 66 |
2.2%
|
|
2018 | 83 |
2.8%
|
|
2019 | 61 |
2.1%
|
|
2020 | 29 |
1%
|
|
2021 | 23 |
0.8%
|
|
2022 | 9 |
0.3%
|