| Value | Category | Cases | |
|---|---|---|---|
| -99 | 6 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 1 | Not effective at all | 2 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    
| 2 | 5 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 6 | 
                                                                 
                                    
                                    2.8%
                                 
                                                             | 
                                                        
                    |
| 4 | 11 | 
                                                                 
                                    
                                    5.2%
                                 
                                                             | 
                                                        
                    |
| 5 | 22 | 
                                                                 
                                    
                                    10.3%
                                 
                                                             | 
                                                        
                    |
| 6 | 14 | 
                                                                 
                                    
                                    6.6%
                                 
                                                             | 
                                                        
                    |
| 7 | 13 | 
                                                                 
                                    
                                    6.1%
                                 
                                                             | 
                                                        
                    |
| 8 | 18 | 
                                                                 
                                    
                                    8.5%
                                 
                                                             | 
                                                        
                    |
| 9 | 8 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 9 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 99 | 
                                                                 
                                    
                                    46.5%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 7 |