| Value | Category | Cases | |
|---|---|---|---|
| 0 | <12 months | 104 |
6.5%
|
| 1 | 1 year | 129 |
8.1%
|
| 2 | 2 years | 282 |
17.6%
|
| 3 | 3 years | 371 |
23.2%
|
| 4 | 4 years | 198 |
12.4%
|
| 5 | 5 years | 325 |
20.3%
|
| 6 | 6+ years | 94 |
5.9%
|
| 7 | Non-numeric | 67 |
4.2%
|
| 8 | Don't know | 29 |
1.8%
|