| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    
| 2 | 4 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 3 | 9 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    |
| 4 | 15 | 
                                                                 
                                    
                                    5.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 30 | 
                                                                 
                                    
                                    11%
                                 
                                                             | 
                                                        
                    |
| 6 | 35 | 
                                                                 
                                    
                                    12.9%
                                 
                                                             | 
                                                        
                    |
| 7 | 51 | 
                                                                 
                                    
                                    18.8%
                                 
                                                             | 
                                                        
                    |
| 8 | 73 | 
                                                                 
                                    
                                    26.8%
                                 
                                                             | 
                                                        
                    |
| 9 | 37 | 
                                                                 
                                    
                                    13.6%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 17 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 103 |