| Value | Category | Cases | |
|---|---|---|---|
| 0 | <12 months | 124 | 
                                    
                                    20.7%
                                 | 
| 1 | 1 year | 68 | 
                                    
                                    11.3%
                                 | 
| 2 | 2 years | 144 | 
                                    
                                    24%
                                 | 
| 3 | 3 years | 102 | 
                                    
                                    17%
                                 | 
| 4 | 4 years | 66 | 
                                    
                                    11%
                                 | 
| 5 | 5 years | 57 | 
                                    
                                    9.5%
                                 | 
| 6 | 6+ years | 20 | 
                                    
                                    3.3%
                                 | 
| 7 | Non-numeric | 9 | 
                                    
                                    1.5%
                                 | 
| 8 | Don't know | 10 | 
                                    
                                    1.7%
                                 |