| Value | Category | Cases | |
|---|---|---|---|
| 1 | monthly | 12 |
27.3%
|
| 2 | quarterly | 4 |
9.1%
|
| 3 | yearly | 28 |
63.6%
|
| Sysmiss | [.a] invalid value | 0 | |
| Sysmiss | 6796 |