| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 2184 |
9.4%
|
| 2 | Monthly | 1157 |
5%
|
| 3 | Yearly | 1198 |
5.1%
|
| 4 | Not all | 18795 |
80.5%
|
| Sysmiss | 1073 |