| Value | Category | Cases | |
|---|---|---|---|
| -99 | 10 | 
                                                                 
                                    
                                    4.7%
                                 
                                                             | 
                                                        
                    |
| 1 | Not effective at all | 2 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    
| 2 | 6 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 3 | 9 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    |
| 4 | 11 | 
                                                                 
                                    
                                    5.1%
                                 
                                                             | 
                                                        
                    |
| 5 | 16 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    |
| 6 | 15 | 
                                                                 
                                    
                                    7%
                                 
                                                             | 
                                                        
                    |
| 7 | 12 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 8 | 20 | 
                                                                 
                                    
                                    9.3%
                                 
                                                             | 
                                                        
                    |
| 9 | 8 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 9 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 97 | 
                                                                 
                                    
                                    45.1%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 5 |