| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 2 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 2006 | 93 | 
                                                                 
                                    
                                    18%
                                 
                                                             | 
                                                        
                    |
| 2007 | 275 | 
                                                                 
                                    
                                    53.1%
                                 
                                                             | 
                                                        
                    |
| 2008 | 148 | 
                                                                 
                                    
                                    28.6%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 104 |