| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 128 |
35.5%
|
| 2 | 12-23 months ago | 64 |
17.7%
|
| 3 | 2 or more years ago | 168 |
46.5%
|
| 9 | Missing | 1 |
0.3%
|
| Sysmiss | 438 |