| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 287 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 2006 | 1587 | 
                                                                 
                                    
                                    19.3%
                                 
                                                             | 
                                                        
                    |
| 2007 | 1660 | 
                                                                 
                                    
                                    20.2%
                                 
                                                             | 
                                                        
                    |
| 2008 | 1705 | 
                                                                 
                                    
                                    20.7%
                                 
                                                             | 
                                                        
                    |
| 2009 | 1718 | 
                                                                 
                                    
                                    20.9%
                                 
                                                             | 
                                                        
                    |
| 2010 | 1275 | 
                                                                 
                                    
                                    15.5%
                                 
                                                             |