| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 81 | 
                                    
                                    5.2%
                                 | |
| 2017 | 252 | 
                                    
                                    16.1%
                                 | |
| 2018 | 281 | 
                                    
                                    18%
                                 | |
| 2019 | 13 | 
                                    
                                    0.8%
                                 | |
| 9999 | NO RESPONSE | 1 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 936 | 
                                    
                                    59.8%
                                 |