| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 38 |
5.4%
|
| 1871 | 1 |
0.1%
|
|
| 1884 | 1 |
0.1%
|
|
| 1897 | 1 |
0.1%
|
|
| 1900 | 1 |
0.1%
|
|
| 1901 | 1 |
0.1%
|
|
| 1905 | 1 |
0.1%
|
|
| 1910 | 2 |
0.3%
|
|
| 1912 | 2 |
0.3%
|
|
| 1920 | 1 |
0.1%
|
|
| 1925 | 3 |
0.4%
|
|
| 1927 | 1 |
0.1%
|
|
| 1930 | 1 |
0.1%
|
|
| 1932 | 1 |
0.1%
|
|
| 1933 | 1 |
0.1%
|
|
| 1937 | 1 |
0.1%
|
|
| 1939 | 1 |
0.1%
|
|
| 1940 | 2 |
0.3%
|
|
| 1941 | 1 |
0.1%
|
|
| 1942 | 1 |
0.1%
|
|
| 1945 | 4 |
0.6%
|
|
| 1946 | 1 |
0.1%
|
|
| 1947 | 4 |
0.6%
|
|
| 1948 | 2 |
0.3%
|
|
| 1949 | 2 |
0.3%
|
|
| 1950 | 8 |
1.1%
|
|
| 1953 | 1 |
0.1%
|
|
| 1954 | 2 |
0.3%
|
|
| 1955 | 4 |
0.6%
|
|
| 1956 | 2 |
0.3%
|
|
| 1958 | 4 |
0.6%
|
|
| 1959 | 1 |
0.1%
|
|
| 1960 | 13 |
1.8%
|
|
| 1962 | 1 |
0.1%
|
|
| 1963 | 3 |
0.4%
|
|
| 1964 | 2 |
0.3%
|
|
| 1965 | 4 |
0.6%
|
|
| 1966 | 1 |
0.1%
|
|
| 1967 | 3 |
0.4%
|
|
| 1968 | 5 |
0.7%
|
|
| 1969 | 3 |
0.4%
|
|
| 1970 | 11 |
1.5%
|
|
| 1971 | 2 |
0.3%
|
|
| 1972 | 12 |
1.7%
|
|
| 1973 | 1 |
0.1%
|
|
| 1974 | 3 |
0.4%
|
|
| 1975 | 13 |
1.8%
|
|
| 1976 | 4 |
0.6%
|
|
| 1977 | 4 |
0.6%
|
|
| 1978 | 7 |
1%
|
|
| 1979 | 4 |
0.6%
|
|
| 1980 | 34 |
4.8%
|
|
| 1981 | 5 |
0.7%
|
|
| 1982 | 8 |
1.1%
|
|
| 1983 | 6 |
0.8%
|
|
| 1984 | 4 |
0.6%
|
|
| 1985 | 24 |
3.4%
|
|
| 1986 | 10 |
1.4%
|
|
| 1987 | 7 |
1%
|
|
| 1988 | 8 |
1.1%
|
|
| 1989 | 8 |
1.1%
|
|
| 1990 | 34 |
4.8%
|
|
| 1991 | 4 |
0.6%
|
|
| 1992 | 11 |
1.5%
|
|
| 1993 | 4 |
0.6%
|
|
| 1994 | 6 |
0.8%
|
|
| 1995 | 24 |
3.4%
|
|
| 1996 | 9 |
1.3%
|
|
| 1997 | 6 |
0.8%
|
|
| 1998 | 10 |
1.4%
|
|
| 1999 | 8 |
1.1%
|
|
| 2000 | 38 |
5.4%
|
|
| 2001 | 8 |
1.1%
|
|
| 2002 | 11 |
1.5%
|
|
| 2003 | 11 |
1.5%
|
|
| 2004 | 11 |
1.5%
|
|
| 2005 | 23 |
3.2%
|
|
| 2006 | 10 |
1.4%
|
|
| 2007 | 10 |
1.4%
|
|
| 2008 | 13 |
1.8%
|
|
| 2009 | 9 |
1.3%
|
|
| 2010 | 27 |
3.8%
|
|
| 2011 | 9 |
1.3%
|
|
| 2012 | 14 |
2%
|
|
| 2013 | 17 |
2.4%
|
|
| 2014 | 17 |
2.4%
|
|
| 2015 | 15 |
2.1%
|
|
| 2016 | 22 |
3.1%
|
|
| 2017 | 13 |
1.8%
|
|
| 2018 | 3 |
0.4%
|
|
| 2019 | 4 |
0.6%
|
|
| 2020 | 2 |
0.3%
|
|
| Sysmiss | 285 |