| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Human Activity | 546 |
22.8%
|
| 2 | Natural processes | 79 |
3.3%
|
| 3 | Both human activity and natural processes | 146 |
6.1%
|
| 4 | None of these | 1 |
0%
|
| 7 | Not applicable | 1578 |
65.8%
|
| 8 | Refused | 2 |
0.1%
|
| 9 | Don’t know / Haven’t heard enough | 48 |
2%
|