| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| 0 | Less than 1 Year | 0 | 
                                    
                                    0%
                                 | 
| 2 | 3 | 
                                    
                                    60%
                                 | |
| 3 | 1 | 
                                    
                                    20%
                                 | |
| 35 | 1 | 
                                    
                                    20%
                                 | |
| Sysmiss | 123 |