| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Human Activity | 461 |
38.4%
|
| 2 | Natural processes | 190 |
15.8%
|
| 3 | Both human activity and natural processes | 68 |
5.7%
|
| 4 | None of these | 0 |
0%
|
| 7 | Not Applicable | 469 |
39.1%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don’t know / Haven’t heard enough | 12 |
1%
|