| Value | Category | Cases | |
|---|---|---|---|
| -99 | 5 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    |
| 1 | Not effective at all | 7 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    
| 2 | 10 | 
                                                                 
                                    
                                    2.5%
                                 
                                                             | 
                                                        
                    |
| 3 | 17 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 4 | 22 | 
                                                                 
                                    
                                    5.6%
                                 
                                                             | 
                                                        
                    |
| 5 | 37 | 
                                                                 
                                    
                                    9.4%
                                 
                                                             | 
                                                        
                    |
| 6 | 38 | 
                                                                 
                                    
                                    9.6%
                                 
                                                             | 
                                                        
                    |
| 7 | 40 | 
                                                                 
                                    
                                    10.1%
                                 
                                                             | 
                                                        
                    |
| 8 | 29 | 
                                                                 
                                    
                                    7.3%
                                 
                                                             | 
                                                        
                    |
| 9 | 21 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 19 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 150 | 
                                                                 
                                    
                                    38%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 12 |