| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 179 |
22.9%
|
| 2 | Quarterly | 465 |
59.5%
|
| 3 | Twice a year | 50 |
6.4%
|
| 4 | Annually | 49 |
6.3%
|
| 96 | Other | 38 |
4.9%
|
| Sysmiss | 744 |