| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 29 |
2.9%
|
| 2 | Monthly | 184 |
18.7%
|
| 3 | Once a term | 472 |
47.9%
|
| 4 | Half Yearly | 28 |
2.8%
|
| 5 | Yearly | 71 |
7.2%
|
| 6 | Ad hoc | 78 |
7.9%
|
| 96 | Other | 124 |
12.6%
|
| Sysmiss | 539 |