Value | Category | Cases | |
---|---|---|---|
-2 | Refusal to answer | 0 |
0%
|
-1 | Don't know | 1 |
0.1%
|
1953 | 1 |
0.1%
|
|
1957 | 2 |
0.1%
|
|
1960 | 3 |
0.2%
|
|
1963 | 1 |
0.1%
|
|
1964 | 5 |
0.3%
|
|
1965 | 3 |
0.2%
|
|
1966 | 3 |
0.2%
|
|
1967 | 3 |
0.2%
|
|
1968 | 4 |
0.2%
|
|
1969 | 10 |
0.5%
|
|
1970 | 20 |
1%
|
|
1971 | 14 |
0.7%
|
|
1972 | 15 |
0.8%
|
|
1973 | 19 |
1%
|
|
1974 | 25 |
1.3%
|
|
1975 | 38 |
1.9%
|
|
1976 | 32 |
1.6%
|
|
1977 | 33 |
1.7%
|
|
1978 | 31 |
1.6%
|
|
1979 | 42 |
2.1%
|
|
1980 | 62 |
3.2%
|
|
1981 | 55 |
2.8%
|
|
1982 | 69 |
3.5%
|
|
1983 | 66 |
3.4%
|
|
1984 | 59 |
3%
|
|
1985 | 85 |
4.3%
|
|
1986 | 70 |
3.6%
|
|
1987 | 62 |
3.2%
|
|
1988 | 78 |
4%
|
|
1989 | 95 |
4.8%
|
|
1990 | 134 |
6.8%
|
|
1991 | 95 |
4.8%
|
|
1992 | 92 |
4.7%
|
|
1993 | 65 |
3.3%
|
|
1994 | 56 |
2.9%
|
|
1995 | 86 |
4.4%
|
|
1996 | 69 |
3.5%
|
|
1997 | 100 |
5.1%
|
|
1998 | 84 |
4.3%
|
|
1999 | 91 |
4.6%
|
|
2000 | 70 |
3.6%
|
|
2001 | 16 |
0.8%
|
|
Sysmiss | 12 |