| Value | Category | Cases | |
|---|---|---|---|
| 1 | Daily | 1370 |
6.5%
|
| 2 | Weekly | 1132 |
5.3%
|
| 3 | Monthly | 482 |
2.3%
|
| 4 | Yearly | 94 |
0.4%
|
| 5 | Not at all | 18108 |
85.5%
|
| Sysmiss | 3974 |