| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 203 |
21%
|
| 2 | Quarterly | 548 |
56.8%
|
| 3 | Twice a year | 120 |
12.4%
|
| 4 | Annually | 94 |
9.7%
|
| Sysmiss | 739 |