| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 239 |
25.2%
|
| 2 | Quarterly | 386 |
40.8%
|
| 3 | Twice a year | 78 |
8.2%
|
| 4 | Annually | 115 |
12.1%
|
| 8 | Other (specify) | 129 |
13.6%
|
| Sysmiss | 648 |