| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 40 | 
                                                                 
                                    
                                    19.9%
                                 
                                                             | 
                                                        
                    
| 2 | 24 | 
                                                                 
                                    
                                    11.9%
                                 
                                                             | 
                                                        
                    |
| 3 | 23 | 
                                                                 
                                    
                                    11.4%
                                 
                                                             | 
                                                        
                    |
| 4 | 19 | 
                                                                 
                                    
                                    9.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 27 | 
                                                                 
                                    
                                    13.4%
                                 
                                                             | 
                                                        
                    |
| 6 | 21 | 
                                                                 
                                    
                                    10.4%
                                 
                                                             | 
                                                        
                    |
| 7 | 10 | 
                                                                 
                                    
                                    5%
                                 
                                                             | 
                                                        
                    |
| 8 | 14 | 
                                                                 
                                    
                                    7%
                                 
                                                             | 
                                                        
                    |
| 9 | 8 | 
                                                                 
                                    
                                    4%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 15 | 
                                                                 
                                    
                                    7.5%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 189 | |
| Sysmiss | 40 |