| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 1366 |
20.2%
|
| 2 | 1-3 years | 3303 |
49%
|
| 3 | 3-5 years | 1211 |
18%
|
| 4 | Longer than 5 years | 808 |
12%
|
| 5 | Don?t remember | 58 |
0.9%
|
| Sysmiss | 5734 |