| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. More than 6 years ago | 25 |
12.4%
|
| 2 | 2. Between 3 and 6 years | 126 |
62.4%
|
| 3 | 3. Less than 3 years ago | 49 |
24.3%
|
| 9 | 9. Don t know | 2 |
1%
|
| Sysmiss | 32 |