| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 8 |
0.3%
|
| 1 | Impassable | 24 |
1%
|
| 2 | Very poor | 400 |
16.7%
|
| 3 | Poor | 428 |
17.9%
|
| 4 | Fair | 788 |
32.9%
|
| 5 | Good | 528 |
22.1%
|
| 6 | Very good | 216 |
9%
|