| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 35 | 
                                                                 
                                    
                                    15.2%
                                 
                                                             | 
                                                        
                    
| 2 | 12 | 
                                                                 
                                    
                                    5.2%
                                 
                                                             | 
                                                        
                    |
| 3 | 18 | 
                                                                 
                                    
                                    7.8%
                                 
                                                             | 
                                                        
                    |
| 4 | 19 | 
                                                                 
                                    
                                    8.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 30 | 
                                                                 
                                    
                                    13%
                                 
                                                             | 
                                                        
                    |
| 6 | 32 | 
                                                                 
                                    
                                    13.9%
                                 
                                                             | 
                                                        
                    |
| 7 | 23 | 
                                                                 
                                    
                                    10%
                                 
                                                             | 
                                                        
                    |
| 8 | 21 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 14 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 27 | 
                                                                 
                                    
                                    11.7%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 158 | |
| Sysmiss | 41 |