| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 2649 |
48.6%
|
| 2 | 12-23 months ago | 1696 |
31.1%
|
| 3 | 2 or more years ago | 1100 |
20.2%
|
| 9 | Missing | 10 |
0.2%
|
| Sysmiss | 11059 |