| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 188 | 
                                    
                                    12%
                                 | |
| 2017 | 264 | 
                                    
                                    16.9%
                                 | |
| 2018 | 250 | 
                                    
                                    16%
                                 | |
| 2019 | 6 | 
                                    
                                    0.4%
                                 | |
| 9999 | NO RESPONSE | 3 | 
                                    
                                    0.2%
                                 | 
| Sysmiss | 853 | 
                                    
                                    54.5%
                                 |