| Value | Category | Cases | |
|---|---|---|---|
| 1 | Annual | 40 |
13.5%
|
| 2 | Per term | 207 |
69.9%
|
| 3 | Monthly | 4 |
1.4%
|
| 4 | When required | 30 |
10.1%
|
| 96 | Other (specify) | 15 |
5.1%
|
| Sysmiss | 1800 |