| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 6 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    
| 2 | 10 | 
                                                                 
                                    
                                    3.2%
                                 
                                                             | 
                                                        
                    |
| 3 | 23 | 
                                                                 
                                    
                                    7.3%
                                 
                                                             | 
                                                        
                    |
| 4 | 31 | 
                                                                 
                                    
                                    9.8%
                                 
                                                             | 
                                                        
                    |
| 5 | 50 | 
                                                                 
                                    
                                    15.8%
                                 
                                                             | 
                                                        
                    |
| 6 | 41 | 
                                                                 
                                    
                                    12.9%
                                 
                                                             | 
                                                        
                    |
| 7 | 51 | 
                                                                 
                                    
                                    16.1%
                                 
                                                             | 
                                                        
                    |
| 8 | 54 | 
                                                                 
                                    
                                    17%
                                 
                                                             | 
                                                        
                    |
| 9 | 31 | 
                                                                 
                                    
                                    9.8%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 20 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    
| -99 | 62 | ||
| 11 | Don't know | 131 | |
| Sysmiss | 147 |