| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 83 |
13.7%
|
| 2 | 1-2 years | 151 |
24.9%
|
| 3 | 3-5 years | 339 |
55.9%
|
| 4 | Don?t remember | 33 |
5.4%
|
| Sysmiss | 11874 |