| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    
| 2 | 5 | 
                                                                 
                                    
                                    2.2%
                                 
                                                             | 
                                                        
                    |
| 3 | 11 | 
                                                                 
                                    
                                    4.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 13 | 
                                                                 
                                    
                                    5.8%
                                 
                                                             | 
                                                        
                    |
| 5 | 25 | 
                                                                 
                                    
                                    11.2%
                                 
                                                             | 
                                                        
                    |
| 6 | 36 | 
                                                                 
                                    
                                    16.1%
                                 
                                                             | 
                                                        
                    |
| 7 | 56 | 
                                                                 
                                    
                                    25%
                                 
                                                             | 
                                                        
                    |
| 8 | 45 | 
                                                                 
                                    
                                    20.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 21 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 8 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 151 |