| Value | Category | Cases | |
|---|---|---|---|
| 1 | Year and month | 5509 | 
                                                                 
                                    
                                    79.2%
                                 
                                                             | 
                                                        
                    
| 8 | DK | 1445 | 
                                                                 
                                    
                                    20.8%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 18583 |