| Value | Category | Cases | |
|---|---|---|---|
| 1 | Shelled | 2625 | 
                                    
                                    52.2%
                                 | 
| 2 | Unshelled | 1502 | 
                                    
                                    29.9%
                                 | 
| 3 | Not applicable | 898 | 
                                    
                                    17.9%
                                 | 
| Sysmiss | 384 |