| Value | Category | Cases | |
|---|---|---|---|
| 0 | 8239 |
4.2%
|
|
| 3 | May | 54675 |
27.6%
|
| 6 | June | 51060 |
25.7%
|
| 9 | September | 38511 |
19.4%
|
| 12 | December | 45886 |
23.1%
|
| Sysmiss | 120387 |