| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 17 |
58.6%
|
| 2 | Twice | 8 |
27.6%
|
| 3 | Tree crop | 3 |
10.3%
|
| 9 | 1 |
3.4%
|
|
| Sysmiss | 57 |