| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 2007 | 4 | 
                                                                 
                                    
                                    14.3%
                                 
                                                             | 
                                                        
                    |
| 2008 | 2 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    |
| 2009 | 11 | 
                                                                 
                                    
                                    39.3%
                                 
                                                             | 
                                                        
                    |
| 2010 | 10 | 
                                                                 
                                    
                                    35.7%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 182 |