| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 2 | 
                                    
                                    0.1%
                                 | |
| 2017 | 168 | 
                                    
                                    10.7%
                                 | |
| 2018 | 199 | 
                                    
                                    12.7%
                                 | |
| 2019 | 17 | 
                                    
                                    1.1%
                                 | |
| 9999 | NO RESPONSE | 2 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 1176 | 
                                    
                                    75.2%
                                 |