| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 1 | 
                                    
                                    7.7%
                                 | |
| 2008 | 9 | 
                                    
                                    69.2%
                                 | |
| 2009 | 2 | 
                                    
                                    15.4%
                                 | |
| 2010 | 1 | 
                                    
                                    7.7%
                                 | |
| Sysmiss | 10837 |