| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 | 
                                    
                                    0%
                                 | 
| 0 | Less than 1 Year | 0 | 
                                    
                                    0%
                                 | 
| 3 | 4 | 
                                    
                                    40%
                                 | |
| 5 | 2 | 
                                    
                                    20%
                                 | |
| 7 | 2 | 
                                    
                                    20%
                                 | |
| 10 | 1 | 
                                    
                                    10%
                                 | |
| 20 | 1 | 
                                    
                                    10%
                                 | |
| Sysmiss | 118 |