| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 2 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    
| 2 | 1 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 3 | 2 | 
                                                                 
                                    
                                    2%
                                 
                                                             | 
                                                        
                    |
| 4 | 7 | 
                                                                 
                                    
                                    7%
                                 
                                                             | 
                                                        
                    |
| 5 | 7 | 
                                                                 
                                    
                                    7%
                                 
                                                             | 
                                                        
                    |
| 6 | 11 | 
                                                                 
                                    
                                    11%
                                 
                                                             | 
                                                        
                    |
| 7 | 19 | 
                                                                 
                                    
                                    19%
                                 
                                                             | 
                                                        
                    |
| 8 | 27 | 
                                                                 
                                    
                                    27%
                                 
                                                             | 
                                                        
                    |
| 9 | 16 | 
                                                                 
                                    
                                    16%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 8 | 
                                                                 
                                    
                                    8%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 32 | |
| Sysmiss | 6 |