Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 358 |
27.1%
|
1833 | 1 |
0.1%
|
|
1857 | 1 |
0.1%
|
|
1886 | 1 |
0.1%
|
|
1896 | 1 |
0.1%
|
|
1910 | 2 |
0.2%
|
|
1913 | 1 |
0.1%
|
|
1920 | 2 |
0.2%
|
|
1923 | 1 |
0.1%
|
|
1926 | 1 |
0.1%
|
|
1927 | 1 |
0.1%
|
|
1938 | 2 |
0.2%
|
|
1939 | 1 |
0.1%
|
|
1941 | 1 |
0.1%
|
|
1942 | 2 |
0.2%
|
|
1943 | 2 |
0.2%
|
|
1947 | 1 |
0.1%
|
|
1948 | 1 |
0.1%
|
|
1949 | 1 |
0.1%
|
|
1954 | 1 |
0.1%
|
|
1955 | 2 |
0.2%
|
|
1956 | 3 |
0.2%
|
|
1957 | 3 |
0.2%
|
|
1958 | 3 |
0.2%
|
|
1959 | 3 |
0.2%
|
|
1960 | 2 |
0.2%
|
|
1961 | 2 |
0.2%
|
|
1962 | 1 |
0.1%
|
|
1963 | 2 |
0.2%
|
|
1964 | 2 |
0.2%
|
|
1965 | 4 |
0.3%
|
|
1966 | 2 |
0.2%
|
|
1968 | 4 |
0.3%
|
|
1969 | 1 |
0.1%
|
|
1970 | 6 |
0.5%
|
|
1971 | 2 |
0.2%
|
|
1972 | 4 |
0.3%
|
|
1973 | 5 |
0.4%
|
|
1974 | 3 |
0.2%
|
|
1975 | 10 |
0.8%
|
|
1976 | 4 |
0.3%
|
|
1977 | 4 |
0.3%
|
|
1978 | 10 |
0.8%
|
|
1979 | 3 |
0.2%
|
|
1980 | 15 |
1.1%
|
|
1981 | 8 |
0.6%
|
|
1982 | 4 |
0.3%
|
|
1983 | 13 |
1%
|
|
1984 | 5 |
0.4%
|
|
1985 | 10 |
0.8%
|
|
1986 | 6 |
0.5%
|
|
1987 | 6 |
0.5%
|
|
1988 | 3 |
0.2%
|
|
1989 | 9 |
0.7%
|
|
1990 | 36 |
2.7%
|
|
1991 | 3 |
0.2%
|
|
1992 | 6 |
0.5%
|
|
1993 | 15 |
1.1%
|
|
1994 | 8 |
0.6%
|
|
1995 | 21 |
1.6%
|
|
1996 | 22 |
1.7%
|
|
1997 | 17 |
1.3%
|
|
1998 | 22 |
1.7%
|
|
1999 | 17 |
1.3%
|
|
2000 | 45 |
3.4%
|
|
2001 | 34 |
2.6%
|
|
2002 | 14 |
1.1%
|
|
2003 | 23 |
1.7%
|
|
2004 | 20 |
1.5%
|
|
2005 | 26 |
2%
|
|
2006 | 20 |
1.5%
|
|
2007 | 28 |
2.1%
|
|
2008 | 28 |
2.1%
|
|
2009 | 21 |
1.6%
|
|
2010 | 145 |
11%
|
|
2011 | 23 |
1.7%
|
|
2012 | 19 |
1.4%
|
|
2013 | 19 |
1.4%
|
|
2014 | 51 |
3.9%
|
|
2015 | 17 |
1.3%
|
|
2016 | 20 |
1.5%
|
|
2017 | 14 |
1.1%
|
|
2018 | 11 |
0.8%
|
|
2019 | 23 |
1.7%
|
|
2020 | 8 |
0.6%
|