| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 7 | 
                                    
                                    0.5%
                                 | |
| 2009 | 1296 | 
                                    
                                    96.4%
                                 | |
| 2010 | 42 | 
                                    
                                    3.1%
                                 | |
| Sysmiss | 619 |