| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 297 |
53.1%
|
| 2 | Twice | 146 |
26.1%
|
| 3 | Three and over | 40 |
7.2%
|
| 4 | Perennial crop | 76 |
13.6%
|
| Sysmiss | 13 |