| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 453 | 
                                    
                                    75%
                                 | |
| 2016 | 124 | 
                                    
                                    20.5%
                                 | |
| 2017 | 20 | 
                                    
                                    3.3%
                                 | |
| 2018 | 6 | 
                                    
                                    1%
                                 | |
| 2019 | 1 | 
                                    
                                    0.2%
                                 | |
| Sysmiss | 296 |