| Value | Category | Cases | |
|---|---|---|---|
| 1 | every month | 3131 |
40.2%
|
| 2 | every six months | 731 |
9.4%
|
| 3 | has made it only once | 424 |
5.5%
|
| 6 | other | 3493 |
44.9%
|
| Sysmiss | 5136 |