| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 8 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    
| 2 | 6 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 2 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 4 | 5 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 5 | 18 | 
                                                                 
                                    
                                    6.9%
                                 
                                                             | 
                                                        
                    |
| 6 | 8 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 14 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 8 | 16 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 16 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 37 | 
                                                                 
                                    
                                    14.1%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 132 | 
                                                                 
                                    
                                    50.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 31 |