| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Human Activity | 234 |
19.5%
|
| 2 | Natural processes | 108 |
9%
|
| 3 | Both human activity and natural processes | 43 |
3.6%
|
| 4 | None of these | 2 |
0.2%
|
| 7 | Not applicable | 793 |
66.1%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don’t know / Haven’t heard enough | 19 |
1.6%
|