| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 728 |
5.2%
|
| 2 | 12-23 months ago | 687 |
4.9%
|
| 3 | 2 or more years ago | 3207 |
22.8%
|
| 9 | Missing | 13 |
0.1%
|
| Sysmiss | 9425 |
67%
|