| Value |
Category |
| -9 |
Don't know |
| 1960 |
|
| 1978 |
|
| 1980 |
|
| 1984 |
|
| 1987 |
|
| 1988 |
|
| 1992 |
|
| 1997 |
|
| 2000 |
|
| 2001 |
|
| 2002 |
|
| 2003 |
|
| 2004 |
|
| 2005 |
|
| 2007 |
|
| 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.
