| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 23 | 
                                                                 
                                    
                                    5.9%
                                 
                                                             | 
                                                        
                    
| 2 | 24 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    |
| 3 | 51 | 
                                                                 
                                    
                                    13%
                                 
                                                             | 
                                                        
                    |
| 4 | 61 | 
                                                                 
                                    
                                    15.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 94 | 
                                                                 
                                    
                                    23.9%
                                 
                                                             | 
                                                        
                    |
| 6 | 67 | 
                                                                 
                                    
                                    17%
                                 
                                                             | 
                                                        
                    |
| 7 | 37 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                                                        
                    |
| 8 | 21 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 9 | 8 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 7 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 81 | |
| Sysmiss | 4 |