| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 1 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 2009 | 7 | 
                                                                 
                                    
                                    4.1%
                                 
                                                             | 
                                                        
                    |
| 2010 | 9 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 2011 | 6 | 
                                                                 
                                    
                                    3.5%
                                 
                                                             | 
                                                        
                    |
| 2012 | 17 | 
                                                                 
                                    
                                    9.9%
                                 
                                                             | 
                                                        
                    |
| 2013 | 23 | 
                                                                 
                                    
                                    13.5%
                                 
                                                             | 
                                                        
                    |
| 2014 | 30 | 
                                                                 
                                    
                                    17.5%
                                 
                                                             | 
                                                        
                    |
| 2015 | 69 | 
                                                                 
                                    
                                    40.4%
                                 
                                                             | 
                                                        
                    |
| 2016 | 9 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 61 |