| Value | Category | Cases | |
|---|---|---|---|
| 2015 | 500 | 
                                    
                                    13.3%
                                 | |
| 2016 | 663 | 
                                    
                                    17.6%
                                 | |
| 2017 | 635 | 
                                    
                                    16.9%
                                 | |
| 2018 | 113 | 
                                    
                                    3%
                                 | |
| 9999 | NO RESPONDE | 2 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 1844 | 
                                    
                                    49.1%
                                 |