| Value | Category | Cases | |
|---|---|---|---|
| 0 | <12 months | 328 | 
                                    
                                    14.9%
                                 | 
| 1 | 1 year | 171 | 
                                    
                                    7.8%
                                 | 
| 2 | 2 years | 356 | 
                                    
                                    16.2%
                                 | 
| 3 | 3 years | 496 | 
                                    
                                    22.5%
                                 | 
| 4 | 4 years | 214 | 
                                    
                                    9.7%
                                 | 
| 5 | 5 years | 351 | 
                                    
                                    16%
                                 | 
| 6 | 6+ years | 123 | 
                                    
                                    5.6%
                                 | 
| 7 | non-numeric | 10 | 
                                    
                                    0.5%
                                 | 
| 8 | don't know | 150 | 
                                    
                                    6.8%
                                 | 
| 9 | 1 | 
                                    
                                    0%
                                 | |
| 11 | .Z | 6039 |