| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    
| 3 | 12 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    |
| 4 | 10 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 23 | 
                                                                 
                                    
                                    8.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 48 | 
                                                                 
                                    
                                    17%
                                 
                                                             | 
                                                        
                    |
| 7 | 59 | 
                                                                 
                                    
                                    20.8%
                                 
                                                             | 
                                                        
                    |
| 8 | 70 | 
                                                                 
                                    
                                    24.7%
                                 
                                                             | 
                                                        
                    |
| 9 | 42 | 
                                                                 
                                    
                                    14.8%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 18 | 
                                                                 
                                    
                                    6.4%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 92 |