| Value | Category | Cases | |
|---|---|---|---|
| 1 | metal | 428 | 
                                                                 
                                    
                                    17.4%
                                 
                                                             | 
                                                        
                    
| 2 | plastic | 1342 | 
                                                                 
                                    
                                    54.5%
                                 
                                                             | 
                                                        
                    
| 3 | both | 628 | 
                                                                 
                                    
                                    25.5%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 65 |