| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
100%
|
| 1 | Annually | 0 | |
| 2 | Biannually/Every six months | 0 | |
| 3 | Quarterly | 0 | |
| 4 | Monthly | 0 | |
| 5 | Weekly | 0 | |
| 6 | Daily | 0 |