| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    
| 2 | 6 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 10 | 
                                                                 
                                    
                                    8.8%
                                 
                                                             | 
                                                        
                    |
| 4 | 12 | 
                                                                 
                                    
                                    10.6%
                                 
                                                             | 
                                                        
                    |
| 5 | 12 | 
                                                                 
                                    
                                    10.6%
                                 
                                                             | 
                                                        
                    |
| 6 | 6 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 7 | 18 | 
                                                                 
                                    
                                    15.9%
                                 
                                                             | 
                                                        
                    |
| 8 | 25 | 
                                                                 
                                    
                                    22.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 18 | 
                                                                 
                                    
                                    15.9%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 4 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 262 |