| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 5 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    
| 2 | 4 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 9 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 21 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    |
| 5 | 47 | 
                                                                 
                                    
                                    14.9%
                                 
                                                             | 
                                                        
                    |
| 6 | 45 | 
                                                                 
                                    
                                    14.3%
                                 
                                                             | 
                                                        
                    |
| 7 | 60 | 
                                                                 
                                    
                                    19%
                                 
                                                             | 
                                                        
                    |
| 8 | 60 | 
                                                                 
                                    
                                    19%
                                 
                                                             | 
                                                        
                    |
| 9 | 33 | 
                                                                 
                                    
                                    10.5%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 31 | 
                                                                 
                                    
                                    9.8%
                                 
                                                             | 
                                                        
                    
| -99 | 68 | ||
| 11 | Don't know | 125 | |
| Sysmiss | 149 |