| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Human Activity | 314 |
26.2%
|
| 2 | Natural processes | 177 |
14.8%
|
| 3 | Both human activity and natural processes | 128 |
10.7%
|
| 4 | None of these | 7 |
0.6%
|
| 7 | Not applicable | 475 |
39.6%
|
| 8 | Refused | 1 |
0.1%
|
| 9 | Don’t know / Haven’t heard enough | 98 |
8.2%
|