| Value | Category | Cases | |
|---|---|---|---|
| 0 | <12 months | 560 |
18.1%
|
| 1 | 1 year | 182 |
5.9%
|
| 2 | 2 years | 339 |
11%
|
| 3 | 3 years | 409 |
13.2%
|
| 4 | 4 years | 357 |
11.5%
|
| 5 | 5 years | 258 |
8.3%
|
| 6 | 6+ years | 333 |
10.8%
|
| 7 | Non-numeric | 541 |
17.5%
|
| 8 | Don't know | 116 |
3.7%
|