| Value | Category | Cases | |
|---|---|---|---|
| 1 | March | 72 |
6.2%
|
| 2 | June | 43 |
3.7%
|
| 3 | August | 509 |
43.6%
|
| 4 | November | 543 |
46.5%
|
| Sysmiss | 681 |