| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    
| 2 | 4 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 3 | 6 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 4 | 6 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 5 | 12 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 7 | 
                                                                 
                                    
                                    6.5%
                                 
                                                             | 
                                                        
                    |
| 7 | 20 | 
                                                                 
                                    
                                    18.5%
                                 
                                                             | 
                                                        
                    |
| 8 | 30 | 
                                                                 
                                    
                                    27.8%
                                 
                                                             | 
                                                        
                    |
| 9 | 17 | 
                                                                 
                                    
                                    15.7%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 5 | 
                                                                 
                                    
                                    4.6%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 267 |