| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Human Activity | 519 |
43.1%
|
| 2 | Natural processes | 220 |
18.3%
|
| 3 | Both human activity and natural processes | 72 |
6%
|
| 4 | None of these | 9 |
0.7%
|
| 7 | Not applicable | 335 |
27.8%
|
| 8 | Refused | 2 |
0.2%
|
| 9 | Don’t know / Haven’t heard enough | 47 |
3.9%
|