| Value | Category | Cases | |
|---|---|---|---|
| 2017 | 411 | 
                                    
                                    6.4%
                                 | |
| 2018 | 1053 | 
                                    
                                    16.5%
                                 | |
| 2019 | 1122 | 
                                    
                                    17.5%
                                 | |
| 2020 | 5 | 
                                    
                                    0.1%
                                 | |
| 9999 | NO RESPONSE | 4 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 3799 | 
                                    
                                    59.4%
                                 |