| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Human Activity | 202 |
16.8%
|
| 2 | Natural processes | 274 |
22.8%
|
| 3 | Both human activity and natural processes | 148 |
12.3%
|
| 4 | None of these | 4 |
0.3%
|
| 7 | Not applicable | 533 |
44.4%
|
| 8 | Refused | 1 |
0.1%
|
| 9 | Don’t know / Haven’t heard enough | 38 |
3.2%
|