| Value | Category | Cases | |
|---|---|---|---|
| 1 | monthly | 81 |
10.2%
|
| 2 | uarterly | 9 |
1.1%
|
| 3 | annually | 35 |
4.4%
|
| 4 | not regular | 673 |
84.3%
|
| Sysmiss | 30 |