| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every 2 months | 3 |
1.1%
|
| 2 | Every 3 months | 1 |
0.4%
|
| 3 | Every month | 267 |
97.8%
|
| 4 | Every six months | 1 |
0.4%
|
| 5 | Once a year (every 12 months) | 1 |
0.4%
|
| Sysmiss | 80 |