| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 154 |
0.6%
|
| 2 | Monthly | 474 |
1.9%
|
| 3 | Yearly | 869 |
3.5%
|
| 4 | Less often | 2200 |
8.9%
|
| 5 | Not at all | 21070 |
85.1%
|
| Sysmiss | 817 |