| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 1913 |
8.1%
|
| 2 | Monthly | 2803 |
11.8%
|
| 3 | Yearly | 1760 |
7.4%
|
| 4 | Not all | 17278 |
72.7%
|
| Sysmiss | 1058 |