| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Manual | 299 | 901 | 
                                                                 
                                    
                                    27.4%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 2 | Special tools | 7 | 13 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 3 | Both methods | 14 | 17 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                            
                        
                        
                            
                    
| Sysmiss | 540 | 2351 |