| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than one year | 30 |
20.7%
|
| 2 | 1-2 years | 43 |
29.7%
|
| 3 | 3-4 years | 21 |
14.5%
|
| 4 | More than 4 years | 49 |
33.8%
|
| 99 | No answer | 0 |
0%
|
| 888 | Don't know | 2 |
1.4%
|
| 999 | Not applicable | 0 |
0%
|
| Sysmiss | 1054 |