| Value |
Category |
| 1 |
In 1998 & 2006 & 2012 |
| 2 |
In 1998 & 2006 (not 2012) |
| 3 |
In 1998 only |
| 4 |
In 2006 & 2012 (not 1998) |
| 5 |
In 2006 only |
| 6 |
In 2012 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.