| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 168 |
23.5%
|
| 2 | Quarterly | 333 |
46.5%
|
| 3 | Twice a year | 105 |
14.7%
|
| 4 | Annually | 109 |
15.2%
|
| 9 | 1 |
0.1%
|
|
| Sysmiss | 234 |