| Value | Category | Cases | |
|---|---|---|---|
| 0 | 68 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 1 | 9 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| Missing value | 3139 | 
                                                                 
                                    
                                    97.6%
                                 
                                                             |