| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 21 |
2.1%
|
| 2 | Monthly | 157 |
16%
|
| 3 | Once a term | 468 |
47.7%
|
| 4 | Half Yearly | 28 |
2.9%
|
| 5 | Yearly | 78 |
7.9%
|
| 6 | Ad hoc | 73 |
7.4%
|
| 96 | Other | 157 |
16%
|
| Sysmiss | 553 |