| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 40 | 
                                                                 
                                    
                                    20.4%
                                 
                                                             | 
                                                        
                    
| 2 | 15 | 
                                                                 
                                    
                                    7.7%
                                 
                                                             | 
                                                        
                    |
| 3 | 16 | 
                                                                 
                                    
                                    8.2%
                                 
                                                             | 
                                                        
                    |
| 4 | 22 | 
                                                                 
                                    
                                    11.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 31 | 
                                                                 
                                    
                                    15.8%
                                 
                                                             | 
                                                        
                    |
| 6 | 17 | 
                                                                 
                                    
                                    8.7%
                                 
                                                             | 
                                                        
                    |
| 7 | 9 | 
                                                                 
                                    
                                    4.6%
                                 
                                                             | 
                                                        
                    |
| 8 | 14 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    |
| 9 | 13 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 19 | 
                                                                 
                                    
                                    9.7%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 196 | |
| Sysmiss | 38 |