| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 768 |
3.2%
|
| 2 | Monthly | 1992 |
8.4%
|
| 3 | Yearly | 1543 |
6.5%
|
| 4 | Not all | 19451 |
81.9%
|
| Sysmiss | 1058 |