| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 1 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    
| 2 | 2 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 3 | 4 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 4 | 6 | 
                                                                 
                                    
                                    4.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 20 | 
                                                                 
                                    
                                    15%
                                 
                                                             | 
                                                        
                    |
| 6 | 11 | 
                                                                 
                                    
                                    8.3%
                                 
                                                             | 
                                                        
                    |
| 7 | 29 | 
                                                                 
                                    
                                    21.8%
                                 
                                                             | 
                                                        
                    |
| 8 | 27 | 
                                                                 
                                    
                                    20.3%
                                 
                                                             | 
                                                        
                    |
| 9 | 27 | 
                                                                 
                                    
                                    20.3%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 6 | 
                                                                 
                                    
                                    4.5%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 242 |