| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 | 
                                    
                                    0%
                                 | |
| 2001 | 5 | 
                                    
                                    0.1%
                                 | |
| 2002 | 2 | 
                                    
                                    0%
                                 | |
| 2003 | 5 | 
                                    
                                    0.1%
                                 | |
| 2004 | 13 | 
                                    
                                    0.3%
                                 | |
| 2005 | 36 | 
                                    
                                    0.8%
                                 | |
| 2006 | 80 | 
                                    
                                    1.9%
                                 | |
| 2007 | 491 | 
                                    
                                    11.4%
                                 | |
| 2008 | 2250 | 
                                    
                                    52.3%
                                 | |
| 2009 | 1414 | 
                                    
                                    32.9%
                                 | |
| 2010 | 4 | 
                                    
                                    0.1%
                                 | |
| Sysmiss | 237 |