| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 16 |
0.7%
|
| 2 | Very poor | 440 |
18.3%
|
| 3 | Poor | 424 |
17.7%
|
| 4 | Fair | 432 |
18%
|
| 5 | Good | 904 |
37.7%
|
| 6 | Very good | 184 |
7.7%
|