| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 206 |
26.5%
|
| 2 | Quarterly | 400 |
51.5%
|
| 3 | Twice a year | 97 |
12.5%
|
| 4 | Annually | 74 |
9.5%
|
| Sysmiss | 183 |