| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Planted with no tilling | 377 |
4.5%
|
| 2 | 2. Once | 1774 |
21%
|
| 3 | 3. Twice | 2956 |
35.1%
|
| 4 | 4. Three and more than three times | 3159 |
37.5%
|
| 5 | 5. Not at all | 166 |
2%
|
| Sysmiss | 10907 |