| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not effective at all | 36 | 
                                                                 
                                    
                                    17.6%
                                 
                                                             | 
                                                        
                    
| 2 | 14 | 
                                                                 
                                    
                                    6.8%
                                 
                                                             | 
                                                        
                    |
| 3 | 22 | 
                                                                 
                                    
                                    10.7%
                                 
                                                             | 
                                                        
                    |
| 4 | 20 | 
                                                                 
                                    
                                    9.8%
                                 
                                                             | 
                                                        
                    |
| 5 | 23 | 
                                                                 
                                    
                                    11.2%
                                 
                                                             | 
                                                        
                    |
| 6 | 28 | 
                                                                 
                                    
                                    13.7%
                                 
                                                             | 
                                                        
                    |
| 7 | 18 | 
                                                                 
                                    
                                    8.8%
                                 
                                                             | 
                                                        
                    |
| 8 | 15 | 
                                                                 
                                    
                                    7.3%
                                 
                                                             | 
                                                        
                    |
| 9 | 13 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 16 | 
                                                                 
                                    
                                    7.8%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 186 | |
| Sysmiss | 39 |