| Value | Category | Cases | |
|---|---|---|---|
| 1 | high quality | 780 |
9.9%
|
| 2 | good | 2761 |
35.1%
|
| 3 | satisfactory | 3478 |
44.2%
|
| 4 | bad | 762 |
9.7%
|
| 5 | very bad | 91 |
1.2%
|