| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 33 |
16.7%
|
| 2 | 1-3 years | 69 |
34.8%
|
| 3 | 3-5 years | 39 |
19.7%
|
| 4 | Longer than 5 years | 51 |
25.8%
|
| 5 | Don't remember | 6 |
3%
|
| Sysmiss | 5952 |