| Value | Category | Cases | |
|---|---|---|---|
| 1 | high quality | 651 |
9.6%
|
| 2 | good | 2141 |
31.4%
|
| 3 | satisfactory | 2895 |
42.5%
|
| 4 | bad | 915 |
13.4%
|
| 5 | very bad | 214 |
3.1%
|