| Value | Category | Cases | |
|---|---|---|---|
| 1 | Up to six months ago | 15 |
0.3%
|
| 2 | Over 6 months ago but up to one year ago | 257 |
5.2%
|
| 3 | Over a year ago, but less than 2 years ago | 407 |
8.3%
|
| 4 | 2 years or more ago but less than 5 years ago | 1005 |
20.4%
|
| 5 | 5 years ago, or more | 3046 |
62%
|
| 99 | Don?t know/can?t remember | 185 |
3.8%
|
| Sysmiss | 9079 |