| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 36 | 
                                    
                                    0.2%
                                 | |
| 2017 | 99 | 
                                    
                                    0.5%
                                 | |
| 2018 | 6 | 
                                    
                                    0%
                                 | |
| 8888 | Not applicable | 20865 | 
                                    
                                    98.5%
                                 | 
| 9999 | Unspecified | 184 | 
                                    
                                    0.9%
                                 |