Value | Category |
---|---|
-5 | other |
-4 | missing data |
-3 | refused to answer |
-2 | not applicable |
-1 | do not know |
0 | currently a student |
1981 | |
1984 | |
1986 | |
1987 | |
1988 | |
1989 | |
1990 | |
1991 | |
1992 | |
1993 | |
1994 | |
1995 | |
1996 | |
1997 | |
1998 | |
1999 | |
2000 | |
2001 | |
2002 | |
2003 | |
2004 |