| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Impassable | 0 |
0%
|
| 2 | Very poor | 288 |
12%
|
| 3 | Poor | 432 |
18%
|
| 4 | Fair | 648 |
27%
|
| 5 | Good | 856 |
35.7%
|
| 6 | Very good | 176 |
7.3%
|