| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 8 | 
                                                                 
                                    
                                    16%
                                 
                                                             | 
                                                        
                    |
| 2007 | 7 | 
                                                                 
                                    
                                    14%
                                 
                                                             | 
                                                        
                    |
| 2008 | 15 | 
                                                                 
                                    
                                    30%
                                 
                                                             | 
                                                        
                    |
| 2009 | 11 | 
                                                                 
                                    
                                    22%
                                 
                                                             | 
                                                        
                    |
| 2010 | 9 | 
                                                                 
                                    
                                    18%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9998 | dk | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 354 |