| Value | Category | Cases | |
|---|---|---|---|
| 1 | monthly | 29 |
20%
|
| 2 | 3 months | 52 |
35.9%
|
| 3 | 6 months | 19 |
13.1%
|
| 4 | year | 45 |
31%
|
| Sysmiss | 16285 |