| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    
| 2 | 2 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 3 | 3 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 4 | 2 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 10 | 
                                                                 
                                    
                                    17.5%
                                 
                                                             | 
                                                        
                    |
| 6 | 2 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 7 | 12 | 
                                                                 
                                    
                                    21.1%
                                 
                                                             | 
                                                        
                    |
| 8 | 12 | 
                                                                 
                                    
                                    21.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 8 | 
                                                                 
                                    
                                    14%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 3 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 76 | |
| Sysmiss | 5 |