| Value |
Category |
| 1 |
Less than one year |
| 2 |
1-2 years |
| 3 |
3-4 years |
| 4 |
More than 4 years |
| 99 |
No answer |
| 888 |
Don't know |
| 999 |
Not applicable |
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.