| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1977 | 
                                                                 
                                    
                                    95.9%
                                 
                                                             | 
                                                        
                    |
| 1 | 50 | 
                                                                 
                                    
                                    2.4%
                                 
                                                             | 
                                                        
                    |
| 98 | 32 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| Missing value | 3 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             |