| Value | Category | Cases | |
|---|---|---|---|
| 0 | <12 months | 767 |
16.5%
|
| 1 | 1 year | 280 |
6%
|
| 2 | 2 years | 572 |
12.3%
|
| 3 | 3 years | 513 |
11%
|
| 4 | 4 years | 269 |
5.8%
|
| 5 | 5 years | 551 |
11.8%
|
| 6 | 6+ years | 540 |
11.6%
|
| 7 | Non-numeric | 1018 |
21.9%
|
| 8 | Don't know | 142 |
3.1%
|