| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year | 1321 | 
                                    
                                    64.5%
                                 | 
| 5 | year - a, m imp | 713 | 
                                    
                                    34.8%
                                 | 
| 7 | month - a, y imp | 0 | 
                                    
                                    0%
                                 | 
| 8 | none - all imp | 13 | 
                                    
                                    0.6%
                                 | 
| Sysmiss | 13304 |