Value | Category |
---|---|
-2 | Refusal to answer |
-1 | Don't know |
0 | |
1904 | |
1930 | |
1934 | |
1937 | |
1938 | |
1940 | |
1942 | |
1946 | |
1948 | |
1949 | |
1950 | |
1951 | |
1953 | |
1954 | |
1955 | |
1956 | |
1957 | |
1958 | |
1959 | |
1960 | |
1961 | |
1962 | |
1964 | |
1965 | |
1966 | |
1967 | |
1969 | |
1970 | |
1971 | |
1972 | |
1974 | |
1975 | |
1977 | |
1978 | |
1979 | |
1980 | |
1981 | |
1982 | |
1983 | |
1984 | |
1985 | |
1986 | |
1987 | |
1988 | |
1990 | |
1991 | |
1992 | |
1993 | |
1994 | |
1995 | |
1996 | |
1997 | |
1998 | |
1999 | |
2000 | |
Sysmiss |