| Value | Category | Cases | |
|---|---|---|---|
| 1 | First year | 682 |
35.7%
|
| 2 | Second year | 595 |
31.1%
|
| 3 | Third year | 429 |
22.4%
|
| 4 | VII grade | 58 |
3%
|
| 5 | VIII grade | 47 |
2.5%
|
| 6 | IX grade | 100 |
5.2%
|
| Sysmiss | 106 |