| Value |
Category |
| -99 |
Dont know |
| 1 |
Last 1 year |
| 2 |
1-2 years |
| 3 |
2-4 years |
| 4 |
4-6 years |
| 5 |
6 years < |
| 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.