| Value | Category | Cases | |
|---|---|---|---|
| 1 | A few months | 82 |
10.2%
|
| 2 | Less than a year | 40 |
5%
|
| 3 | More than a year | 680 |
84.8%
|
| 99 | Refuse to answer | 0 |
0%
|
| Sysmiss | 846 |