| Value | Category | Cases | |
|---|---|---|---|
| 1 | Up to six months ago | 1 |
0.1%
|
| 2 | Over 6 months ago but up to one year ago | 63 |
7.5%
|
| 3 | Over a year ago, but less than 2 years ago | 77 |
9.2%
|
| 4 | 2 years or more ago but less than 5 years ago | 192 |
23%
|
| 5 | 5 years ago, or more | 480 |
57.4%
|
| 99 | Don?t know/can?t remember | 23 |
2.8%
|
| Sysmiss | 13158 |