Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 2 |
0.2%
|
1890 | 1 |
0.1%
|
|
1900 | 1 |
0.1%
|
|
1901 | 1 |
0.1%
|
|
1905 | 1 |
0.1%
|
|
1918 | 1 |
0.1%
|
|
1919 | 1 |
0.1%
|
|
1934 | 1 |
0.1%
|
|
1935 | 1 |
0.1%
|
|
1944 | 1 |
0.1%
|
|
1946 | 1 |
0.1%
|
|
1947 | 1 |
0.1%
|
|
1949 | 2 |
0.2%
|
|
1954 | 1 |
0.1%
|
|
1955 | 1 |
0.1%
|
|
1957 | 2 |
0.2%
|
|
1959 | 1 |
0.1%
|
|
1960 | 4 |
0.4%
|
|
1961 | 1 |
0.1%
|
|
1962 | 2 |
0.2%
|
|
1964 | 2 |
0.2%
|
|
1965 | 4 |
0.4%
|
|
1967 | 4 |
0.4%
|
|
1968 | 4 |
0.4%
|
|
1969 | 4 |
0.4%
|
|
1970 | 5 |
0.5%
|
|
1972 | 4 |
0.4%
|
|
1973 | 4 |
0.4%
|
|
1974 | 4 |
0.4%
|
|
1975 | 1 |
0.1%
|
|
1976 | 3 |
0.3%
|
|
1977 | 6 |
0.6%
|
|
1978 | 5 |
0.5%
|
|
1979 | 6 |
0.6%
|
|
1980 | 10 |
1%
|
|
1981 | 4 |
0.4%
|
|
1982 | 4 |
0.4%
|
|
1983 | 6 |
0.6%
|
|
1984 | 8 |
0.8%
|
|
1985 | 2 |
0.2%
|
|
1986 | 7 |
0.7%
|
|
1987 | 7 |
0.7%
|
|
1988 | 8 |
0.8%
|
|
1989 | 14 |
1.4%
|
|
1990 | 32 |
3.1%
|
|
1991 | 8 |
0.8%
|
|
1992 | 8 |
0.8%
|
|
1993 | 9 |
0.9%
|
|
1994 | 20 |
2%
|
|
1995 | 19 |
1.9%
|
|
1996 | 22 |
2.1%
|
|
1997 | 17 |
1.7%
|
|
1998 | 24 |
2.3%
|
|
1999 | 22 |
2.1%
|
|
2000 | 28 |
2.7%
|
|
2001 | 17 |
1.7%
|
|
2002 | 14 |
1.4%
|
|
2003 | 18 |
1.8%
|
|
2004 | 35 |
3.4%
|
|
2005 | 24 |
2.3%
|
|
2006 | 25 |
2.4%
|
|
2007 | 28 |
2.7%
|
|
2008 | 22 |
2.1%
|
|
2009 | 22 |
2.1%
|
|
2010 | 35 |
3.4%
|
|
2011 | 25 |
2.4%
|
|
2012 | 33 |
3.2%
|
|
2013 | 30 |
2.9%
|
|
2014 | 49 |
4.8%
|
|
2015 | 43 |
4.2%
|
|
2016 | 46 |
4.5%
|
|
2017 | 36 |
3.5%
|
|
2018 | 51 |
5%
|
|
2019 | 52 |
5.1%
|
|
2020 | 30 |
2.9%
|
|
2021 | 24 |
2.3%
|
|
2022 | 2 |
0.2%
|
|
2023 | 1 |
0.1%
|