| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 381 |
5.3%
|
| 2 | Quarterly | 4223 |
59%
|
| 3 | Every semester | 1237 |
17.3%
|
| 4 | Yearly | 1316 |
18.4%
|
| Sysmiss | 2135 |