| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 174 |
6.3%
|
| 1920 | 1 |
0%
|
|
| 1924 | 1 |
0%
|
|
| 1935 | 1 |
0%
|
|
| 1938 | 1 |
0%
|
|
| 1948 | 2 |
0.1%
|
|
| 1949 | 2 |
0.1%
|
|
| 1950 | 1 |
0%
|
|
| 1952 | 1 |
0%
|
|
| 1955 | 1 |
0%
|
|
| 1956 | 3 |
0.1%
|
|
| 1960 | 1 |
0%
|
|
| 1962 | 2 |
0.1%
|
|
| 1964 | 1 |
0%
|
|
| 1965 | 1 |
0%
|
|
| 1967 | 1 |
0%
|
|
| 1968 | 2 |
0.1%
|
|
| 1969 | 2 |
0.1%
|
|
| 1970 | 11 |
0.4%
|
|
| 1971 | 5 |
0.2%
|
|
| 1972 | 2 |
0.1%
|
|
| 1973 | 2 |
0.1%
|
|
| 1974 | 6 |
0.2%
|
|
| 1975 | 13 |
0.5%
|
|
| 1976 | 8 |
0.3%
|
|
| 1977 | 3 |
0.1%
|
|
| 1978 | 8 |
0.3%
|
|
| 1979 | 5 |
0.2%
|
|
| 1980 | 26 |
0.9%
|
|
| 1981 | 13 |
0.5%
|
|
| 1982 | 19 |
0.7%
|
|
| 1983 | 13 |
0.5%
|
|
| 1984 | 17 |
0.6%
|
|
| 1985 | 46 |
1.7%
|
|
| 1986 | 11 |
0.4%
|
|
| 1987 | 10 |
0.4%
|
|
| 1988 | 18 |
0.7%
|
|
| 1989 | 21 |
0.8%
|
|
| 1990 | 104 |
3.8%
|
|
| 1991 | 27 |
1%
|
|
| 1992 | 44 |
1.6%
|
|
| 1993 | 32 |
1.2%
|
|
| 1994 | 35 |
1.3%
|
|
| 1995 | 98 |
3.6%
|
|
| 1996 | 50 |
1.8%
|
|
| 1997 | 40 |
1.5%
|
|
| 1998 | 80 |
2.9%
|
|
| 1999 | 46 |
1.7%
|
|
| 2000 | 164 |
6%
|
|
| 2001 | 85 |
3.1%
|
|
| 2002 | 86 |
3.1%
|
|
| 2003 | 77 |
2.8%
|
|
| 2004 | 80 |
2.9%
|
|
| 2005 | 157 |
5.7%
|
|
| 2006 | 121 |
4.4%
|
|
| 2007 | 82 |
3%
|
|
| 2008 | 131 |
4.8%
|
|
| 2009 | 97 |
3.5%
|
|
| 2010 | 149 |
5.4%
|
|
| 2011 | 79 |
2.9%
|
|
| 2012 | 82 |
3%
|
|
| 2013 | 55 |
2%
|
|
| 2014 | 41 |
1.5%
|
|
| 2015 | 94 |
3.4%
|
|
| 2016 | 63 |
2.3%
|
|
| 2017 | 38 |
1.4%
|
|
| 2018 | 37 |
1.3%
|
|
| 2019 | 12 |
0.4%
|
|
| 2020 | 4 |
0.1%
|
|
| 2021 | 9 |
0.3%
|
|
| Sysmiss | 15903 |