| value | category | cases | |
|---|---|---|---|
| 0 | <12 months | 6196 |
40.5%
|
| 1 | 1 year | 1171 |
7.6%
|
| 2 | 2 years | 2968 |
19.4%
|
| 3 | 3 years | 2370 |
15.5%
|
| 4 | 4 years | 864 |
5.6%
|
| 5 | 5 years | 563 |
3.7%
|
| 6 | 6+ years | 257 |
1.7%
|
| 7 | non-numeric | 524 |
3.4%
|
| 8 | don't know | 402 |
2.6%
|
| 11 | .Z | 22669 |