| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 29 | 
                                                                 
                                    
                                    11.3%
                                 
                                                             | 
                                                        
                    
| 2 | 17 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    |
| 3 | 19 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 24 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                                                        
                    |
| 5 | 29 | 
                                                                 
                                    
                                    11.3%
                                 
                                                             | 
                                                        
                    |
| 6 | 33 | 
                                                                 
                                    
                                    12.9%
                                 
                                                             | 
                                                        
                    |
| 7 | 23 | 
                                                                 
                                    
                                    9%
                                 
                                                             | 
                                                        
                    |
| 8 | 25 | 
                                                                 
                                    
                                    9.8%
                                 
                                                             | 
                                                        
                    |
| 9 | 16 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 41 | 
                                                                 
                                    
                                    16%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 145 | |
| Sysmiss | 29 |