| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Human Activity | 244 |
20.4%
|
| 2 | Natural processes | 162 |
13.5%
|
| 3 | Both human activity and natural processes | 163 |
13.6%
|
| 4 | None of these | 9 |
0.8%
|
| 7 | Not applicable | 560 |
46.7%
|
| 8 | Refused | 29 |
2.4%
|
| 9 | Don’t know / Haven’t heard enough | 31 |
2.6%
|