| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 227 |
27.3%
|
| 2 | Quarterly | 245 |
29.4%
|
| 3 | Twice a year | 76 |
9.1%
|
| 4 | Annually | 107 |
12.8%
|
| 8 | Other | 178 |
21.4%
|
| Sysmiss | 492 |