| Value | Category | Cases | |
|---|---|---|---|
| 1 | Daily | 2102 |
9.9%
|
| 2 | Weekly | 2637 |
12.4%
|
| 3 | Monthly | 1027 |
4.8%
|
| 4 | Yearly | 149 |
0.7%
|
| 5 | Not at all | 15271 |
72.1%
|
| Sysmiss | 3974 |