| Value | Category | Cases | |
|---|---|---|---|
| 1 | Month | 3575 |
58.1%
|
| 2 | Year | 1310 |
21.3%
|
| 3 | Don't know the amount for either | 1049 |
17.1%
|
| 4 | Refused | 216 |
3.5%
|