| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 4 | 
                                                                 
                                    
                                    14.3%
                                 
                                                             | 
                                                        
                    |
| 2006 | 13 | 
                                                                 
                                    
                                    46.4%
                                 
                                                             | 
                                                        
                    |
| 2007 | 9 | 
                                                                 
                                    
                                    32.1%
                                 
                                                             | 
                                                        
                    |
| 2008 | 1 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 1 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    
| 9998 | dk | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 10001 | .Z | 18726 |