| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 2 | 1 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 4 | 5 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 5 | 4 | 
                                                                 
                                    
                                    4%
                                 
                                                             | 
                                                        
                    |
| 6 | 8 | 
                                                                 
                                    
                                    8%
                                 
                                                             | 
                                                        
                    |
| 7 | 21 | 
                                                                 
                                    
                                    21%
                                 
                                                             | 
                                                        
                    |
| 8 | 29 | 
                                                                 
                                    
                                    29%
                                 
                                                             | 
                                                        
                    |
| 9 | 23 | 
                                                                 
                                    
                                    23%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 9 | 
                                                                 
                                    
                                    9%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 38 |