| Value | Category | Cases | |
|---|---|---|---|
| 1 | 0 | 778 | 
                                                                 
                                    
                                    4%
                                 
                                                             | 
                                                        
                    
| 2 | 1 | 244 | 
                                                                 
                                    
                                    1.3%
                                 
                                                             | 
                                                        
                    
| Missing value | 18494 | 
                                                                 
                                    
                                    94.8%
                                 
                                                             |