| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 32 | 
                                                                 
                                    
                                    11.1%
                                 
                                                             | 
                                                        
                    
| 2 | 17 | 
                                                                 
                                    
                                    5.9%
                                 
                                                             | 
                                                        
                    |
| 3 | 19 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    |
| 4 | 30 | 
                                                                 
                                    
                                    10.4%
                                 
                                                             | 
                                                        
                    |
| 5 | 31 | 
                                                                 
                                    
                                    10.7%
                                 
                                                             | 
                                                        
                    |
| 6 | 37 | 
                                                                 
                                    
                                    12.8%
                                 
                                                             | 
                                                        
                    |
| 7 | 29 | 
                                                                 
                                    
                                    10%
                                 
                                                             | 
                                                        
                    |
| 8 | 30 | 
                                                                 
                                    
                                    10.4%
                                 
                                                             | 
                                                        
                    |
| 9 | 18 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 46 | 
                                                                 
                                    
                                    15.9%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 109 | |
| Sysmiss | 32 |