| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 2009 |
8.1%
|
| 2 | Monthly | 1032 |
4.2%
|
| 3 | Yearly | 587 |
2.4%
|
| 4 | Less often | 2242 |
9.1%
|
| 5 | Not at all | 18897 |
76.3%
|
| Sysmiss | 817 |