| Value | Category | Cases | |
|---|---|---|---|
| 0 | NOT GIVEN | 1 | 
                                    
                                    0%
                                 | 
| 2017 | 972 | 
                                    
                                    15.2%
                                 | |
| 2018 | 1178 | 
                                    
                                    18.4%
                                 | |
| 2019 | 1142 | 
                                    
                                    17.9%
                                 | |
| 2020 | 10 | 
                                    
                                    0.2%
                                 | |
| 9999 | NO RESPONSE | 7 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 3084 | 
                                    
                                    48.2%
                                 |