| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    
| 2 | 1 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 3 | 4 | 
                                                                 
                                    
                                    2.7%
                                 
                                                             | 
                                                        
                    |
| 4 | 6 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    |
| 5 | 9 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    |
| 6 | 19 | 
                                                                 
                                    
                                    13%
                                 
                                                             | 
                                                        
                    |
| 7 | 22 | 
                                                                 
                                    
                                    15.1%
                                 
                                                             | 
                                                        
                    |
| 8 | 53 | 
                                                                 
                                    
                                    36.3%
                                 
                                                             | 
                                                        
                    |
| 9 | 22 | 
                                                                 
                                    
                                    15.1%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 9 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 229 |