| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 2696 |
11.3%
|
| 2 | Monthly | 4187 |
17.6%
|
| 3 | Yearly | 2443 |
10.3%
|
| 4 | Not all | 14428 |
60.7%
|
| Sysmiss | 1058 |