| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 8 | 
                                    
                                    5.1%
                                 | |
| 2007 | 23 | 
                                    
                                    14.6%
                                 | |
| 2008 | 24 | 
                                    
                                    15.2%
                                 | |
| 2009 | 78 | 
                                    
                                    49.4%
                                 | |
| 2010 | 25 | 
                                    
                                    15.8%
                                 | |
| Sysmiss | 1252 |