| Value | Category | Cases | |
|---|---|---|---|
| 1 | Up to six months ago | 19 |
0.3%
|
| 2 | Over 6 months ago but up to one year ago | 626 |
8.9%
|
| 3 | Over a year ago, but less than 2 years ago | 1220 |
17.4%
|
| 4 | 2 years or more ago but less than 5 years ago | 2413 |
34.3%
|
| 5 | 5 years ago, or more | 2611 |
37.2%
|
| 99 | Don?t know/can?t remember | 137 |
1.9%
|
| Sysmiss | 6968 |