| Value | Category | Cases | |
|---|---|---|---|
| 1 | monthly | 68 |
6%
|
| 2 | uarterly | 10 |
0.9%
|
| 3 | annually | 73 |
6.4%
|
| 4 | not regular | 985 |
86.7%
|
| Sysmiss | 20 |