| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 141 | 
                                    
                                    9%
                                 | |
| 2017 | 256 | 
                                    
                                    16.4%
                                 | |
| 2018 | 250 | 
                                    
                                    16%
                                 | |
| 2019 | 5 | 
                                    
                                    0.3%
                                 | |
| 9999 | NO RESPONSE | 2 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 910 | 
                                    
                                    58.2%
                                 |