| Value | Category | Cases | |
|---|---|---|---|
| -2 | Don't know | 0 |
0%
|
| -1 | Refuse | 0 |
0%
|
| 1 | Less than 1 year | 1 |
2.9%
|
| 2 | 1 to 2 years | 3 |
8.8%
|
| 3 | 3 to 5 years | 8 |
23.5%
|
| 4 | More than 5 years | 22 |
64.7%
|
| Sysmiss | 255 |