| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 2 | 5 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 3 | 3 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 6 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 5 | 13 | 
                                                                 
                                    
                                    8.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 12 | 
                                                                 
                                    
                                    7.5%
                                 
                                                             | 
                                                        
                    |
| 7 | 21 | 
                                                                 
                                    
                                    13%
                                 
                                                             | 
                                                        
                    |
| 8 | 32 | 
                                                                 
                                    
                                    19.9%
                                 
                                                             | 
                                                        
                    |
| 9 | 2 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 11 | 
                                                                 
                                    
                                    6.8%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 55 | 
                                                                 
                                    
                                    34.2%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 25 |