| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 145 |
24.2%
|
| 2 | Quarterly | 389 |
64.8%
|
| 3 | Twice a year | 37 |
6.2%
|
| 4 | Annually | 29 |
4.8%
|
| Sysmiss | 321 |