| Value | Category | Cases | |
|---|---|---|---|
| 1 | Daily | 521 |
2.5%
|
| 2 | Weekly | 602 |
2.8%
|
| 3 | Monthly | 587 |
2.8%
|
| 4 | Yearly | 180 |
0.8%
|
| 5 | Not at all | 19296 |
91.1%
|
| Sysmiss | 3974 |