| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 371 |
9.6%
|
| 2 | 1-3 years | 1134 |
29.4%
|
| 3 | 3-5 years | 2199 |
57%
|
| 4 | Don?t remember | 151 |
3.9%
|
| Sysmiss | 8625 |