| Value | Category | Cases | |
|---|---|---|---|
| 0 | <12 months | 133 | 
                                    
                                    24%
                                 | 
| 1 | 1 year | 57 | 
                                    
                                    10.3%
                                 | 
| 2 | 2 years | 89 | 
                                    
                                    16.1%
                                 | 
| 3 | 3 years | 103 | 
                                    
                                    18.6%
                                 | 
| 4 | 4 years | 48 | 
                                    
                                    8.7%
                                 | 
| 5 | 5 years | 94 | 
                                    
                                    17%
                                 | 
| 6 | 6+ years | 17 | 
                                    
                                    3.1%
                                 | 
| 7 | Non-numeric | 3 | 
                                    
                                    0.5%
                                 | 
| 8 | Don't know | 10 | 
                                    
                                    1.8%
                                 |