| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 1 | 
                                    
                                    3%
                                 | |
| 2010 | 1 | 
                                    
                                    3%
                                 | |
| 2011 | 1 | 
                                    
                                    3%
                                 | |
| 2012 | 2 | 
                                    
                                    6.1%
                                 | |
| 2013 | 3 | 
                                    
                                    9.1%
                                 | |
| 2014 | 3 | 
                                    
                                    9.1%
                                 | |
| 2015 | 14 | 
                                    
                                    42.4%
                                 | |
| 2016 | 8 | 
                                    
                                    24.2%
                                 | |
| Sysmiss | 306 |