| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 5 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    
| 2 | 4 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 8 | 
                                                                 
                                    
                                    4.6%
                                 
                                                             | 
                                                        
                    |
| 4 | 9 | 
                                                                 
                                    
                                    5.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 24 | 
                                                                 
                                    
                                    13.9%
                                 
                                                             | 
                                                        
                    |
| 6 | 13 | 
                                                                 
                                    
                                    7.5%
                                 
                                                             | 
                                                        
                    |
| 7 | 19 | 
                                                                 
                                    
                                    11%
                                 
                                                             | 
                                                        
                    |
| 8 | 15 | 
                                                                 
                                    
                                    8.7%
                                 
                                                             | 
                                                        
                    |
| 9 | 6 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 3 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 67 | 
                                                                 
                                    
                                    38.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 13 |