| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 235 | 
                                    
                                    11.3%
                                 | 
| 2 | Years passed | 1796 | 
                                    
                                    86.6%
                                 | 
| 8 | DK | 44 | 
                                    
                                    2.1%
                                 | 
| Sysmiss | 22869 |