Value | Category |
---|---|
-9 | Don't know (SPONTANEOUS) |
-8 | |
1947 | |
1949 | |
1950 | |
1952 | |
1955 | |
1967 | |
1970 | |
1972 | |
1973 | |
1978 | |
1979 | |
1980 | |
1984 | |
1985 | |
1987 | |
1989 | |
1990 | |
1992 | |
1993 | |
1994 | |
1995 | |
1996 | |
1997 | |
1998 | |
1999 | |
2000 | |
2001 | |
2002 | |
2003 | |
2004 | |
2005 | |
2006 | |
2007 | |
2008 | |
2009 | |
2010 | |
2011 | |
2012 | |
Sysmiss |