| Value | Category | Cases | |
|---|---|---|---|
| 2013 | 1 | 
                                    
                                    0.2%
                                 | |
| 2014 | 421 | 
                                    
                                    91.9%
                                 | |
| 2015 | 36 | 
                                    
                                    7.9%
                                 | |
| Sysmiss | 1191 |