| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 35 | 
                                                                 
                                    
                                    17.3%
                                 
                                                             | 
                                                        
                    
| 2 | 17 | 
                                                                 
                                    
                                    8.4%
                                 
                                                             | 
                                                        
                    |
| 3 | 18 | 
                                                                 
                                    
                                    8.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 17 | 
                                                                 
                                    
                                    8.4%
                                 
                                                             | 
                                                        
                    |
| 5 | 34 | 
                                                                 
                                    
                                    16.8%
                                 
                                                             | 
                                                        
                    |
| 6 | 25 | 
                                                                 
                                    
                                    12.4%
                                 
                                                             | 
                                                        
                    |
| 7 | 14 | 
                                                                 
                                    
                                    6.9%
                                 
                                                             | 
                                                        
                    |
| 8 | 11 | 
                                                                 
                                    
                                    5.4%
                                 
                                                             | 
                                                        
                    |
| 9 | 11 | 
                                                                 
                                    
                                    5.4%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 20 | 
                                                                 
                                    
                                    9.9%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 186 | |
| Sysmiss | 42 |