| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 12 months ago | 63 |
0.3%
|
| 2 | 12-23 months ago | 60 |
0.3%
|
| 3 | 2 or more years ago | 8 |
0%
|
| 9 | Missing | 6 |
0%
|
| Sysmiss | 18477 |
99.3%
|