| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 1 | 
                                    
                                    0.6%
                                 | |
| 2001 | 1 | 
                                    
                                    0.6%
                                 | |
| 2002 | 3 | 
                                    
                                    1.8%
                                 | |
| 2004 | 2 | 
                                    
                                    1.2%
                                 | |
| 2005 | 8 | 
                                    
                                    4.9%
                                 | |
| 2006 | 8 | 
                                    
                                    4.9%
                                 | |
| 2007 | 19 | 
                                    
                                    11.6%
                                 | |
| 2008 | 47 | 
                                    
                                    28.7%
                                 | |
| 2009 | 61 | 
                                    
                                    37.2%
                                 | |
| 2010 | 12 | 
                                    
                                    7.3%
                                 | |
| 2011 | 2 | 
                                    
                                    1.2%
                                 | |
| Sysmiss | 10686 |