Value | Category |
---|---|
-9 | don't know |
1951 | |
1955 | |
1956 | |
1958 | |
1959 | |
1960 | |
1968 | |
1970 | |
1971 | |
1972 | |
1973 | |
1974 | |
1975 | |
1976 | |
1978 | |
1979 | |
1980 | |
1982 | |
1983 | |
1984 | |
1985 | |
1986 | |
1987 | |
1988 | |
1989 | |
1990 | |
1991 | |
1992 | |
1993 | |
1994 | |
1995 | |
1996 | |
1997 | |
1998 | |
1999 | |
2000 | |
2001 | |
2002 | |
2003 | |
2004 | |
2005 | |
Sysmiss |