| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 1 | Human Activity | 340 |
28.3%
|
| 2 | Natural processes | 190 |
15.8%
|
| 3 | Both human activity and natural processes | 79 |
6.6%
|
| 4 | None of these | 13 |
1.1%
|
| 7 | Not applicable | 563 |
46.9%
|
| 8 | Refused | 0 |
0%
|
| 9 | Don’t know / Haven’t heard enough | 15 |
1.3%
|