| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 608 |
2.6%
|
| 2 | Monthly | 2877 |
12.3%
|
| 3 | Yearly | 1350 |
5.8%
|
| 4 | Not all | 18499 |
79.3%
|
| Sysmiss | 1073 |