| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 454 | 
                                    
                                    4.5%
                                 | |
| 2016 | 1593 | 
                                    
                                    15.7%
                                 | |
| 2017 | 1831 | 
                                    
                                    18%
                                 | |
| 2018 | 371 | 
                                    
                                    3.7%
                                 | |
| 9999 | NO RESPONSE | 22 | 
                                    
                                    0.2%
                                 | 
| Sysmiss | 5885 | 
                                    
                                    57.9%
                                 |