| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 640 | 
                                    
                                    6.3%
                                 | |
| 2016 | 1598 | 
                                    
                                    15.7%
                                 | |
| 2017 | 1867 | 
                                    
                                    18.4%
                                 | |
| 2018 | 435 | 
                                    
                                    4.3%
                                 | |
| 9999 | NO RESPONSE | 22 | 
                                    
                                    0.2%
                                 | 
| Sysmiss | 5594 | 
                                    
                                    55.1%
                                 |