| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 149 |
11.2%
|
| 2 | 1 year to 2 years | 214 |
16.1%
|
| 3 | More than 2 years but less than 5 years | 179 |
13.5%
|
| 4 | More than 5 years | 483 |
36.3%
|
| 5 | Don't know | 305 |
22.9%
|
| Sysmiss | 11150 |