| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. within 1 year | 30 |
93.8%
|
| 2 | 2. 2-3 years ago | 1 |
3.1%
|
| 3 | 3. 4 or more years | 1 |
3.1%
|
| Sysmiss | 67 |