| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 164 |
20.3%
|
| 2 | Quarterly | 482 |
59.7%
|
| 3 | Twice a year | 45 |
5.6%
|
| 4 | Annually | 49 |
6.1%
|
| 96 | Other | 67 |
8.3%
|
| Sysmiss | 728 |