| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 2 | 2 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 3 | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 4 | 4 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 14 | 
                                                                 
                                    
                                    7.5%
                                 
                                                             | 
                                                        
                    |
| 6 | 28 | 
                                                                 
                                    
                                    15.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 42 | 
                                                                 
                                    
                                    22.6%
                                 
                                                             | 
                                                        
                    |
| 8 | 36 | 
                                                                 
                                    
                                    19.4%
                                 
                                                             | 
                                                        
                    |
| 9 | 21 | 
                                                                 
                                    
                                    11.3%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 21 | 
                                                                 
                                    
                                    11.3%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 18 | 
                                                                 
                                    
                                    9.7%
                                 
                                                             |