| Value | Category | Cases | |
|---|---|---|---|
| 1 | Every 2 months | 5 |
0.9%
|
| 2 | Every 3 months | 4 |
0.7%
|
| 3 | Every month | 472 |
88.1%
|
| 4 | Every six months | 3 |
0.6%
|
| 5 | Once a year (every 12 months) | 51 |
9.5%
|
| 6 | Other | 1 |
0.2%
|
| Sysmiss | 52 |