| Value |
Category |
| -9 |
Don’t know |
| 1960 |
|
| 1980 |
|
| 1988 |
|
| 1989 |
|
| 1991 |
|
| 1994 |
|
| 1995 |
|
| 1996 |
|
| 1999 |
|
| 2000 |
|
| 2003 |
|
| 2004 |
|
| 2010 |
|
| 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.
