| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 152 |
22%
|
| 2 | Quarterly | 345 |
50%
|
| 3 | Twice a year | 116 |
16.8%
|
| 4 | Annually | 77 |
11.2%
|
| Sysmiss | 90 |