Value | Category | Cases | |
---|---|---|---|
-9 | Don't know (spontaneous) | 15 |
4.1%
|
1935 | 1 |
0.3%
|
|
1948 | 1 |
0.3%
|
|
1951 | 1 |
0.3%
|
|
1955 | 1 |
0.3%
|
|
1957 | 2 |
0.5%
|
|
1958 | 1 |
0.3%
|
|
1959 | 1 |
0.3%
|
|
1960 | 1 |
0.3%
|
|
1961 | 1 |
0.3%
|
|
1964 | 1 |
0.3%
|
|
1965 | 1 |
0.3%
|
|
1967 | 1 |
0.3%
|
|
1969 | 2 |
0.5%
|
|
1970 | 1 |
0.3%
|
|
1973 | 4 |
1.1%
|
|
1974 | 2 |
0.5%
|
|
1975 | 5 |
1.4%
|
|
1976 | 2 |
0.5%
|
|
1977 | 2 |
0.5%
|
|
1978 | 6 |
1.6%
|
|
1979 | 2 |
0.5%
|
|
1980 | 4 |
1.1%
|
|
1981 | 5 |
1.4%
|
|
1982 | 8 |
2.2%
|
|
1983 | 3 |
0.8%
|
|
1984 | 3 |
0.8%
|
|
1985 | 4 |
1.1%
|
|
1986 | 5 |
1.4%
|
|
1987 | 7 |
1.9%
|
|
1988 | 2 |
0.5%
|
|
1989 | 3 |
0.8%
|
|
1990 | 8 |
2.2%
|
|
1991 | 1 |
0.3%
|
|
1992 | 6 |
1.6%
|
|
1993 | 6 |
1.6%
|
|
1994 | 15 |
4.1%
|
|
1995 | 18 |
4.9%
|
|
1996 | 18 |
4.9%
|
|
1997 | 9 |
2.5%
|
|
1998 | 14 |
3.8%
|
|
1999 | 6 |
1.6%
|
|
2000 | 23 |
6.3%
|
|
2001 | 3 |
0.8%
|
|
2002 | 11 |
3%
|
|
2003 | 14 |
3.8%
|
|
2004 | 4 |
1.1%
|
|
2005 | 10 |
2.7%
|
|
2006 | 5 |
1.4%
|
|
2007 | 11 |
3%
|
|
2008 | 6 |
1.6%
|
|
2009 | 13 |
3.6%
|
|
2010 | 13 |
3.6%
|
|
2011 | 8 |
2.2%
|
|
2012 | 13 |
3.6%
|
|
2013 | 8 |
2.2%
|
|
2014 | 4 |
1.1%
|
|
2015 | 10 |
2.7%
|
|
2016 | 5 |
1.4%
|
|
2017 | 3 |
0.8%
|
|
2018 | 1 |
0.3%
|
|
Sysmiss | 1 |