| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 2 years | 94 |
15.2%
|
| 2 | 2 or more years | 463 |
74.9%
|
| 98 | Don't know | 57 |
9.2%
|
| 99 | Refused | 4 |
0.6%
|
| Sysmiss | 3527 |