| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 1 | 
                                    
                                    25%
                                 | |
| 2008 | 1 | 
                                    
                                    25%
                                 | |
| 2009 | 2 | 
                                    
                                    50%
                                 | |
| Sysmiss | 134 |