| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    
| 2 | 3 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 8 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    |
| 4 | 10 | 
                                                                 
                                    
                                    7.6%
                                 
                                                             | 
                                                        
                    |
| 5 | 12 | 
                                                                 
                                    
                                    9.2%
                                 
                                                             | 
                                                        
                    |
| 6 | 23 | 
                                                                 
                                    
                                    17.6%
                                 
                                                             | 
                                                        
                    |
| 7 | 23 | 
                                                                 
                                    
                                    17.6%
                                 
                                                             | 
                                                        
                    |
| 8 | 34 | 
                                                                 
                                    
                                    26%
                                 
                                                             | 
                                                        
                    |
| 9 | 13 | 
                                                                 
                                    
                                    9.9%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 4 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 244 |