| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 3 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| 2 | 8 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 3 | 8 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 4 | 14 | 
                                                                 
                                    
                                    6.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 21 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    |
| 6 | 19 | 
                                                                 
                                    
                                    8.4%
                                 
                                                             | 
                                                        
                    |
| 7 | 18 | 
                                                                 
                                    
                                    8%
                                 
                                                             | 
                                                        
                    |
| 8 | 23 | 
                                                                 
                                    
                                    10.2%
                                 
                                                             | 
                                                        
                    |
| 9 | 10 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 10 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 91 | 
                                                                 
                                    
                                    40.4%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 12 |