| Value | Category | Cases | |
|---|---|---|---|
| 1 | monthly | 130 |
7.5%
|
| 2 | uarterly | 43 |
2.5%
|
| 3 | annually | 70 |
4%
|
| 4 | not regular | 1488 |
86%
|
| Sysmiss | 89 |