| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Once | 7244 |
96.7%
|
| 2 | 2. Twice | 162 |
2.2%
|
| 3 | 3. Not applicable(Permanent crop) | 82 |
1.1%
|
| Sysmiss | 7390 |