| Value |
Category |
| -9 |
Do Not Know |
| 1953 |
|
| 1975 |
|
| 1981 |
|
| 1984 |
|
| 1985 |
|
| 1986 |
|
| 1988 |
|
| 1989 |
|
| 1990 |
|
| 1998 |
|
| 2004 |
|
| 2006 |
|
| 2008 |
|
| 2009 |
|
| 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.
