| Value |
Category |
| -9 |
don't know |
| 1970 |
|
| 1982 |
|
| 1986 |
|
| 1988 |
|
| 1989 |
|
| 1990 |
|
| 1991 |
|
| 1993 |
|
| 1995 |
|
| 1998 |
|
| 2000 |
|
| 2001 |
|
| 2003 |
|
| 2004 |
|
| 2005 |
|
| 2006 |
|
| 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.
