| Value | Category | Cases | |
|---|---|---|---|
| 1994 | 1 | 
                                    
                                    0%
                                 | |
| 1995 | 2 | 
                                    
                                    0.1%
                                 | |
| 2003 | 2 | 
                                    
                                    0.1%
                                 | |
| 2006 | 1 | 
                                    
                                    0%
                                 | |
| 2007 | 350 | 
                                    
                                    14.3%
                                 | |
| 2008 | 826 | 
                                    
                                    33.8%
                                 | |
| 2009 | 1261 | 
                                    
                                    51.6%
                                 | |
| Sysmiss | 29919 |