| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 5 years | 260 |
21.2%
|
| 2 | About 5 years to 10 years | 206 |
16.8%
|
| 3 | Over 10 years | 365 |
29.8%
|
| 4 | Dont know /not sure | 393 |
32.1%
|
| Sysmiss | 2388 |