| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year ago | 3 |
6.4%
|
| 2 | Between 1 and 2 years ago | 13 |
27.7%
|
| 20 | More than 2 years ago | 31 |
66%
|
| Sysmiss | 2224 |