| Value | Category | Cases | |
|---|---|---|---|
| 1 | Two years or less | 2268 |
19.8%
|
| 2 | Three to five years | 2128 |
18.6%
|
| 3 | More than five years | 6589 |
57.6%
|
| 4 | Don’t know | 449 |
3.9%
|
| Sysmiss | 5947 |