| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 837 |
5.4%
|
| 2 | 12-23 months ago | 806 |
5.2%
|
| 3 | 2 or more years ago | 5481 |
35.1%
|
| 9 | Missing | 13 |
0.1%
|
| Sysmiss | 8470 |
54.3%
|