| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    
| 2 | 3 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 3 | 5 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 25 | 
                                                                 
                                    
                                    6.9%
                                 
                                                             | 
                                                        
                    |
| 5 | 34 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                                                        
                    |
| 6 | 60 | 
                                                                 
                                    
                                    16.6%
                                 
                                                             | 
                                                        
                    |
| 7 | 63 | 
                                                                 
                                    
                                    17.4%
                                 
                                                             | 
                                                        
                    |
| 8 | 71 | 
                                                                 
                                    
                                    19.6%
                                 
                                                             | 
                                                        
                    |
| 9 | 45 | 
                                                                 
                                    
                                    12.4%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 54 | 
                                                                 
                                    
                                    14.9%
                                 
                                                             | 
                                                        
                    
| -99 | 68 | ||
| 11 | Don't know | 76 | |
| Sysmiss | 151 |