| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 7 | 
                                    
                                    0.4%
                                 | |
| 2016 | 248 | 
                                    
                                    15.9%
                                 | |
| 2017 | 271 | 
                                    
                                    17.3%
                                 | |
| 2018 | 223 | 
                                    
                                    14.3%
                                 | |
| 2019 | 8 | 
                                    
                                    0.5%
                                 | |
| 9999 | NO RESPONSE | 2 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 805 | 
                                    
                                    51.5%
                                 |