| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 2 years | 99 |
4.3%
|
| 2 | 2 to 5 years | 420 |
18.3%
|
| 3 | 6 to 10 years | 402 |
17.5%
|
| 4 | More than 10 years | 1337 |
58.2%
|
| 98 | Don’t know | 38 |
1.7%
|
| Sysmiss | 475 |