| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    
| 2 | 1 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 5 | 
                                                                 
                                    
                                    6.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 3 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    |
| 5 | 9 | 
                                                                 
                                    
                                    11.5%
                                 
                                                             | 
                                                        
                    |
| 6 | 9 | 
                                                                 
                                    
                                    11.5%
                                 
                                                             | 
                                                        
                    |
| 7 | 9 | 
                                                                 
                                    
                                    11.5%
                                 
                                                             | 
                                                        
                    |
| 8 | 22 | 
                                                                 
                                    
                                    28.2%
                                 
                                                             | 
                                                        
                    |
| 9 | 13 | 
                                                                 
                                    
                                    16.7%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 4 | 
                                                                 
                                    
                                    5.1%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 51 | |
| Sysmiss | 9 |