| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 567 |
2.4%
|
| 2 | Monthly | 3103 |
13.1%
|
| 3 | Yearly | 1687 |
7.1%
|
| 4 | Not all | 18397 |
77.4%
|
| Sysmiss | 1058 |