| Value | Category | Cases | |
|---|---|---|---|
| 1 | 7th year | 927 |
29.6%
|
| 2 | 8th year | 875 |
27.9%
|
| 3 | 9th year | 705 |
22.5%
|
| 4 | 10th year | 629 |
20.1%
|
| Sysmiss | 16 |