| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1 |
3.8%
|
|
| 1 | Monthly | 5 |
19.2%
|
| 2 | Quarterly | 3 |
11.5%
|
| 3 | Annually | 5 |
19.2%
|
| 4 | One off | 12 |
46.2%
|
| Sysmiss | 1827 |