| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 598 |
2.4%
|
| 2 | Monthly | 2670 |
10.8%
|
| 3 | Yearly | 4287 |
17.4%
|
| 4 | Not all | 17071 |
69.3%
|
| Sysmiss | 534 |