| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 8 |
0%
|
| 1 | Impassable | 928 |
2%
|
| 2 | Very poor | 7665 |
16.7%
|
| 3 | Poor | 7688 |
16.8%
|
| 4 | Fair | 11940 |
26.1%
|
| 5 | Good | 12655 |
27.6%
|
| 6 | Very good | 4939 |
10.8%
|