| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    
| 2 | 2 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 3 | 4 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 4 | 4 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 7 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    |
| 6 | 7 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    |
| 7 | 26 | 
                                                                 
                                    
                                    23%
                                 
                                                             | 
                                                        
                    |
| 8 | 30 | 
                                                                 
                                    
                                    26.5%
                                 
                                                             | 
                                                        
                    |
| 9 | 21 | 
                                                                 
                                    
                                    18.6%
                                 
                                                             | 
                                                        
                    |
| 10 | Extremely effective | 9 | 
                                                                 
                                    
                                    8%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 22 | |
| Sysmiss | 3 |