| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 251 |
49.9%
|
| 2 | Quarterly | 249 |
49.5%
|
| 3 | Every semester | 2 |
0.4%
|
| 4 | Yearly | 1 |
0.2%
|
| Sysmiss | 44 |