| Value | Category | Cases | |
|---|---|---|---|
| 1 | March | 790 |
27.5%
|
| 2 | June | 758 |
26.4%
|
| 3 | August | 688 |
23.9%
|
| 4 | November | 637 |
22.2%
|
| Sysmiss | 1007 |