| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 2 years | 70 |
4%
|
| 2 | 2 to 5 years | 369 |
21%
|
| 3 | 6 to 10 years | 355 |
20.3%
|
| 4 | More than 10 years | 866 |
49.4%
|
| 98 | Don’t know | 93 |
5.3%
|
| Sysmiss | 821 |