| Value | Category | Cases | |
|---|---|---|---|
| 1 | 6 grade | 1628 |
13.9%
|
| 2 | 7 grade | 4080 |
34.8%
|
| 3 | 8 grade | 3445 |
29.4%
|
| 4 | 1 grade secondary | 2582 |
22%
|
| Sysmiss | 147 |