| Value | Category | Cases | |
|---|---|---|---|
| 2016 | 253 | 
                                    
                                    6.7%
                                 | |
| 2017 | 416 | 
                                    
                                    11.1%
                                 | |
| 2018 | 2 | 
                                    
                                    0.1%
                                 | |
| 9999 | NO RESPONDE | 1 | 
                                    
                                    0%
                                 | 
| Sysmiss | 3085 | 
                                    
                                    82.1%
                                 |