| Value | Category | Cases | |
|---|---|---|---|
| 0 | <12 months | 300 | 
                                                                 
                                    
                                    8.6%
                                 
                                                             | 
                                                        
                    
| 1 | 1 year | 168 | 
                                                                 
                                    
                                    4.8%
                                 
                                                             | 
                                                        
                    
| 2 | 2 years | 489 | 
                                                                 
                                    
                                    14%
                                 
                                                             | 
                                                        
                    
| 3 | 3 years | 677 | 
                                                                 
                                    
                                    19.3%
                                 
                                                             | 
                                                        
                    
| 4 | 4 years | 420 | 
                                                                 
                                    
                                    12%
                                 
                                                             | 
                                                        
                    
| 5 | 5 years | 812 | 
                                                                 
                                    
                                    23.2%
                                 
                                                             | 
                                                        
                    
| 6 | 6+ years | 373 | 
                                                                 
                                    
                                    10.7%
                                 
                                                             | 
                                                        
                    
| 7 | non-numeric | 25 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    
| 8 | don't know | 235 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    
| 11 | .Z | 4733 |