| Valor | Categoría | Casos | |
|---|---|---|---|
| 1998 | 4 | 
                                    
                                    1.3%
                                 | |
| 2006 | 2 | 
                                    
                                    0.6%
                                 | |
| 2007 | 5 | 
                                    
                                    1.6%
                                 | |
| 2008 | 1 | 
                                    
                                    0.3%
                                 | |
| 2009 | 4 | 
                                    
                                    1.3%
                                 | |
| 2010 | 13 | 
                                    
                                    4.1%
                                 | |
| 2011 | 53 | 
                                    
                                    16.6%
                                 | |
| 2012 | 234 | 
                                    
                                    73.4%
                                 | |
| 2013 | 1 | 
                                    
                                    0.3%
                                 | |
| 9999 | 2 | 
                                    
                                    0.6%
                                 |