| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 447 |
1.8%
|
| 2 | Monthly | 1077 |
4.4%
|
| 3 | Yearly | 915 |
3.7%
|
| 4 | Less often | 2163 |
8.8%
|
| 5 | Not at all | 20048 |
81.3%
|
| Sysmiss | 510 |