| Value | Category | Cases | |
|---|---|---|---|
| 1 | Within last year | 116 |
29.4%
|
| 2 | Within last two years | 60 |
15.2%
|
| 3 | Longer than two years | 182 |
46.1%
|
| 4 | Can't remember | 37 |
9.4%
|
| Sysmiss | 992 |