| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 174 |
21.3%
|
| 2 | Quarterly | 426 |
52.2%
|
| 3 | Twice a year | 80 |
9.8%
|
| 4 | Annually | 61 |
7.5%
|
| 8 | Other (specify) | 75 |
9.2%
|
| Sysmiss | 604 |