| Value | Category | Cases | |
|---|---|---|---|
| -99 | 10 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    |
| 1 | Not effective at all | 5 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    
| 2 | 7 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    |
| 3 | 6 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 4 | 12 | 
                                                                 
                                    
                                    5.7%
                                 
                                                             | 
                                                        
                    |
| 5 | 17 | 
                                                                 
                                    
                                    8.1%
                                 
                                                             | 
                                                        
                    |
| 6 | 19 | 
                                                                 
                                    
                                    9%
                                 
                                                             | 
                                                        
                    |
| 7 | 15 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    |
| 8 | 19 | 
                                                                 
                                    
                                    9%
                                 
                                                             | 
                                                        
                    |
| 9 | 4 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 10 | Very effective | 10 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    
| 11 | Don't know | 86 | 
                                                                 
                                    
                                    41%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 10 |