| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 2 | 
                                    
                                    3.8%
                                 | |
| 2013 | 6 | 
                                    
                                    11.5%
                                 | |
| 2014 | 10 | 
                                    
                                    19.2%
                                 | |
| 2015 | 34 | 
                                    
                                    65.4%
                                 | |
| Sysmiss | 1448 |