Value |
Category |
-2 |
Refusal to answer |
-1 |
Don't know |
1960 |
|
1980 |
|
1990 |
|
1991 |
|
1992 |
|
1994 |
|
1996 |
|
1997 |
|
1998 |
|
1999 |
|
2000 |
|
Sysmiss |
|
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.