| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    
| 2 | 3 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 3 | 1 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 4 | 5 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 5 | 11 | 
                                                                 
                                    
                                    6.5%
                                 
                                                             | 
                                                        
                    |
| 6 | 17 | 
                                                                 
                                    
                                    10.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 24 | 
                                                                 
                                    
                                    14.2%
                                 
                                                             | 
                                                        
                    |
| 8 | 23 | 
                                                                 
                                    
                                    13.6%
                                 
                                                             | 
                                                        
                    |
| 9 | 5 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 8 | 
                                                                 
                                    
                                    4.7%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 70 | 
                                                                 
                                    
                                    41.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 17 |