| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 502 |
30.4%
|
| 2 | This term | 518 |
31.4%
|
| 3 | Last term | 272 |
16.5%
|
| 4 | More than a year ago | 358 |
21.7%
|
| Sysmiss | 50 |