| Value | Category | Cases | |
|---|---|---|---|
| 1 | Monthly | 5 |
12.2%
|
| 2 | Quarterly | 4 |
9.8%
|
| 3 | Annually | 1 |
2.4%
|
| 4 | One off | 31 |
75.6%
|
| 5 | Don't know | 0 |
0%
|
| Sysmiss | 2073 |