| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 210 |
23.3%
|
| 2 | Quarterly | 406 |
45.1%
|
| 3 | Twice a year | 103 |
11.4%
|
| 4 | Annually | 106 |
11.8%
|
| 8 | Other (specify) | 76 |
8.4%
|
| Sysmiss | 444 |