| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 2620 |
10.9%
|
| 2 | Monthly | 1952 |
8.1%
|
| 3 | Yearly | 1035 |
4.3%
|
| 4 | Not all | 18490 |
76.7%
|
| Sysmiss | 392 |