| Value | Category | Cases | |
|---|---|---|---|
| -98 | Don't know | 452 |
22.3%
|
| 1 | Only in the case of rust | 571 |
28.2%
|
| 2 | In case of rusting and cracking | 925 |
45.7%
|
| 3 | When there is lower than normal rain | 77 |
3.8%
|
| Sysmiss | 184 |