| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 3 | 
                                    
                                    37.5%
                                 | |
| 2009 | 4 | 
                                    
                                    50%
                                 | |
| 2010 | 1 | 
                                    
                                    12.5%
                                 | |
| Sysmiss | 415 |