| Value | Category | Cases | |
|---|---|---|---|
| 0 | 4 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1 | 18 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 2 | 4156 | 
                                                                 
                                    
                                    99.5%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 322 |