| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 20 | 
                                    
                                    3.9%
                                 | 
| 2 | Between 1 and 4 | 147 | 
                                    
                                    28.6%
                                 | 
| 3 | Between5 and 9 years | 116 | 
                                    
                                    22.6%
                                 | 
| 4 | 10 years + | 231 | 
                                    
                                    44.9%
                                 | 
| Sysmiss | 77 |