| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 44 |
19.3%
|
| 2 | 12-23 months ago | 37 |
16.2%
|
| 3 | 2 or more years ago | 144 |
63.2%
|
| 9 | Missing | 3 |
1.3%
|
| Sysmiss | 4490 |