| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 865 |
36.8%
|
| 2 | 1 year to less than 3 years | 1125 |
47.8%
|
| 3 | 3 years or more | 346 |
14.7%
|
| 9 | Unspecified | 17 |
0.7%
|
| Sysmiss | 63701 |