| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.8%
|
| -7 | Never regiestered (spontaneous) | 0 |
0%
|
| 1905 | 1 |
0.3%
|
|
| 1911 | 1 |
0.3%
|
|
| 1919 | 1 |
0.3%
|
|
| 1922 | 1 |
0.3%
|
|
| 1925 | 1 |
0.3%
|
|
| 1930 | 1 |
0.3%
|
|
| 1932 | 1 |
0.3%
|
|
| 1934 | 1 |
0.3%
|
|
| 1935 | 1 |
0.3%
|
|
| 1937 | 1 |
0.3%
|
|
| 1938 | 1 |
0.3%
|
|
| 1941 | 1 |
0.3%
|
|
| 1942 | 2 |
0.6%
|
|
| 1944 | 3 |
0.8%
|
|
| 1945 | 2 |
0.6%
|
|
| 1947 | 2 |
0.6%
|
|
| 1950 | 2 |
0.6%
|
|
| 1951 | 1 |
0.3%
|
|
| 1952 | 2 |
0.6%
|
|
| 1956 | 2 |
0.6%
|
|
| 1957 | 1 |
0.3%
|
|
| 1958 | 2 |
0.6%
|
|
| 1959 | 2 |
0.6%
|
|
| 1960 | 2 |
0.6%
|
|
| 1961 | 3 |
0.8%
|
|
| 1962 | 2 |
0.6%
|
|
| 1963 | 4 |
1.1%
|
|
| 1964 | 1 |
0.3%
|
|
| 1966 | 1 |
0.3%
|
|
| 1967 | 1 |
0.3%
|
|
| 1968 | 1 |
0.3%
|
|
| 1969 | 2 |
0.6%
|
|
| 1970 | 2 |
0.6%
|
|
| 1971 | 2 |
0.6%
|
|
| 1972 | 1 |
0.3%
|
|
| 1973 | 4 |
1.1%
|
|
| 1974 | 3 |
0.8%
|
|
| 1975 | 2 |
0.6%
|
|
| 1976 | 5 |
1.4%
|
|
| 1977 | 2 |
0.6%
|
|
| 1978 | 1 |
0.3%
|
|
| 1979 | 2 |
0.6%
|
|
| 1980 | 5 |
1.4%
|
|
| 1981 | 3 |
0.8%
|
|
| 1982 | 2 |
0.6%
|
|
| 1983 | 4 |
1.1%
|
|
| 1984 | 3 |
0.8%
|
|
| 1985 | 5 |
1.4%
|
|
| 1986 | 2 |
0.6%
|
|
| 1987 | 2 |
0.6%
|
|
| 1988 | 6 |
1.7%
|
|
| 1989 | 4 |
1.1%
|
|
| 1990 | 2 |
0.6%
|
|
| 1991 | 3 |
0.8%
|
|
| 1992 | 5 |
1.4%
|
|
| 1993 | 6 |
1.7%
|
|
| 1994 | 10 |
2.8%
|
|
| 1995 | 6 |
1.7%
|
|
| 1996 | 5 |
1.4%
|
|
| 1997 | 3 |
0.8%
|
|
| 1998 | 8 |
2.2%
|
|
| 1999 | 8 |
2.2%
|
|
| 2000 | 5 |
1.4%
|
|
| 2001 | 6 |
1.7%
|
|
| 2002 | 7 |
1.9%
|
|
| 2003 | 8 |
2.2%
|
|
| 2004 | 11 |
3.1%
|
|
| 2005 | 10 |
2.8%
|
|
| 2006 | 13 |
3.6%
|
|
| 2007 | 9 |
2.5%
|
|
| 2008 | 14 |
3.9%
|
|
| 2009 | 5 |
1.4%
|
|
| 2010 | 13 |
3.6%
|
|
| 2011 | 11 |
3.1%
|
|
| 2012 | 8 |
2.2%
|
|
| 2013 | 7 |
1.9%
|
|
| 2014 | 7 |
1.9%
|
|
| 2015 | 8 |
2.2%
|
|
| 2016 | 12 |
3.3%
|
|
| 2017 | 7 |
1.9%
|
|
| 2018 | 6 |
1.7%
|
|
| 2019 | 7 |
1.9%
|
|
| 2020 | 2 |
0.6%
|
|
| 2021 | 7 |
1.9%
|
|
| 2022 | 6 |
1.7%
|
|
| 2023 | 2 |
0.6%
|