| Value |
Category |
| 1 |
1993, 1998, 2004 |
| 2 |
1998, 2004 |
| 3 |
1993, 2004 |
| 4 |
2004 only |
| 5 |
1993, 1998 |
| 6 |
1998 only |
| 7 |
1993 only |
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.