| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 3698 |
15.6%
|
| 2 | Monthly | 688 |
2.9%
|
| 3 | Yearly | 428 |
1.8%
|
| 4 | Not all | 18940 |
79.7%
|
| Sysmiss | 1058 |