| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 2010 | 6 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 2011 | 3490 | 
                                                                 
                                    
                                    86.5%
                                 
                                                             | 
                                                        
                    |
| 2012 | 536 | 
                                                                 
                                    
                                    13.3%
                                 
                                                             |