| Value | Category | Cases | |
|---|---|---|---|
| 1 | every month | 7544 |
39.8%
|
| 2 | every six months | 1769 |
9.3%
|
| 3 | has made it only once | 1002 |
5.3%
|
| 6 | other | 8632 |
45.6%
|
| Sysmiss | 19771 |