| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 701 |
31%
|
| 2 | 1-3 years | 938 |
41.5%
|
| 3 | 3-5 years | 231 |
10.2%
|
| 4 | Longer than 5 years | 269 |
11.9%
|
| 5 | Don't remember | 123 |
5.4%
|
| Sysmiss | 3888 |