| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 1555 |
6.2%
|
| 2 | Monthly | 2875 |
11.5%
|
| 3 | Yearly | 2976 |
11.9%
|
| 4 | Not all | 17639 |
70.4%
|
| Sysmiss | 69 |