| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 2006 | 45 | 
                                                                 
                                    
                                    9.1%
                                 
                                                             | 
                                                        
                    |
| 2007 | 247 | 
                                                                 
                                    
                                    49.8%
                                 
                                                             | 
                                                        
                    |
| 2008 | 203 | 
                                                                 
                                    
                                    40.9%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 126 |