| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 - Not effective at all | 4 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    
| 2 | 2 | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    
| 3 | 3 | 8 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    
| 4 | 4 | 9 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    
| 5 | 5 | 16 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    
| 6 | 6 | 14 | 
                                                                 
                                    
                                    5.4%
                                 
                                                             | 
                                                        
                    
| 7 | 7 | 17 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    
| 8 | 8 | 25 | 
                                                                 
                                    
                                    9.7%
                                 
                                                             | 
                                                        
                    
| 9 | 9 | 6 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    
| 10 | 10 - Very effective | 4 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 154 | 
                                                                 
                                    
                                    59.7%
                                 
                                                             |