| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 564 |
2.4%
|
| 2 | Monthly | 2790 |
11.7%
|
| 3 | Yearly | 4930 |
20.8%
|
| 4 | Not all | 15470 |
65.1%
|
| Sysmiss | 1058 |