| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 143 |
24.2%
|
| 2 | Quarterly | 370 |
62.7%
|
| 3 | Twice a year | 42 |
7.1%
|
| 4 | Annually | 35 |
5.9%
|
| Sysmiss | 325 |