| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    
| 2 | 2 | 2 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    
| 3 | 3 | 12 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    
| 4 | 4 | 8 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    
| 5 | 5 | 15 | 
                                                                 
                                    
                                    11.4%
                                 
                                                             | 
                                                        
                    
| 6 | 6 | 17 | 
                                                                 
                                    
                                    12.9%
                                 
                                                             | 
                                                        
                    
| 7 | 7 | 20 | 
                                                                 
                                    
                                    15.2%
                                 
                                                             | 
                                                        
                    
| 8 | 8 | 8 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    
| 9 | 9 | 7 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    
| 10 | Very effective | 3 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 39 | 
                                                                 
                                    
                                    29.5%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 14 |