| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    
| 2 | 8 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 3 | 11 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 4 | 8 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 5 | 18 | 
                                                                 
                                    
                                    8.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 13 | 
                                                                 
                                    
                                    5.9%
                                 
                                                             | 
                                                        
                    |
| 7 | 21 | 
                                                                 
                                    
                                    9.5%
                                 
                                                             | 
                                                        
                    |
| 8 | 25 | 
                                                                 
                                    
                                    11.3%
                                 
                                                             | 
                                                        
                    |
| 9 | 5 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 12 | 
                                                                 
                                    
                                    5.4%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 97 | 
                                                                 
                                    
                                    43.7%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 15 |