| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 191 | 
                                    
                                    12.2%
                                 | |
| 2017 | 268 | 
                                    
                                    17.1%
                                 | |
| 2018 | 257 | 
                                    
                                    16.4%
                                 | |
| 2019 | 7 | 
                                    
                                    0.4%
                                 | |
| 9999 | NO RESPONSE | 2 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 839 | 
                                    
                                    53.6%
                                 |