| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 600 | 
                                    
                                    9.4%
                                 | |
| 2018 | 891 | 
                                    
                                    13.9%
                                 | |
| 2019 | 1092 | 
                                    
                                    17.1%
                                 | |
| 2020 | 9 | 
                                    
                                    0.1%
                                 | |
| 9999 | NO RESPONSE | 4 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 3798 | 
                                    
                                    59.4%
                                 |