| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 59 |
6.4%
|
| 2 | Monthly | 132 |
14.2%
|
| 3 | Yearly | 90 |
9.7%
|
| 4 | Not all | 647 |
69.7%
|
| Sysmiss | 71 |