| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 2004 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 2005 | 2 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 2006 | 9 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 2007 | 1892 | 
                                                                 
                                    
                                    61.3%
                                 
                                                             | 
                                                        
                    |
| 2008 | 1180 | 
                                                                 
                                    
                                    38.2%
                                 
                                                             |