| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 55 | 
                                    
                                    65.5%
                                 | 
| 2 | Twice | 28 | 
                                    
                                    33.3%
                                 | 
| 3 | Tree crop | 0 | 
                                    
                                    0%
                                 | 
| 9 | 1 | 
                                    
                                    1.2%
                                 | |
| Sysmiss | 2 |