| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 monts ago | 548 |
50.6%
|
| 2 | 12-23 months ago | 475 |
43.9%
|
| 3 | 2 or more years ago | 58 |
5.4%
|
| 9 | Missing | 1 |
0.1%
|
| Sysmiss | 8517 |