| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 2 | 
                                    
                                    0.1%
                                 | |
| 2016 | 290 | 
                                    
                                    7.7%
                                 | |
| 2017 | 615 | 
                                    
                                    16.4%
                                 | |
| 2018 | 198 | 
                                    
                                    5.3%
                                 | |
| 9999 | NO RESPONDE | 1 | 
                                    
                                    0%
                                 | 
| Sysmiss | 2651 | 
                                    
                                    70.6%
                                 |