| Value | Category | Cases | |
|---|---|---|---|
| 1 | high quality | 460 |
8.9%
|
| 2 | good | 1894 |
36.5%
|
| 3 | satisfactory | 2191 |
42.2%
|
| 4 | bad | 582 |
11.2%
|
| 5 | very bad | 60 |
1.2%
|