| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 4 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    
| 2 | 5 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 3 | 14 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    |
| 4 | 23 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    |
| 5 | 42 | 
                                                                 
                                    
                                    11.4%
                                 
                                                             | 
                                                        
                    |
| 6 | 66 | 
                                                                 
                                    
                                    17.9%
                                 
                                                             | 
                                                        
                    |
| 7 | 70 | 
                                                                 
                                    
                                    19%
                                 
                                                             | 
                                                        
                    |
| 8 | 61 | 
                                                                 
                                    
                                    16.6%
                                 
                                                             | 
                                                        
                    |
| 9 | 47 | 
                                                                 
                                    
                                    12.8%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 36 | 
                                                                 
                                    
                                    9.8%
                                 
                                                             | 
                                                        
                    
| -99 | 66 | ||
| 11 | Don't know | 71 | |
| Sysmiss | 152 |