| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 684 |
33.3%
|
| 2 | 1 year to less than 3 years | 1019 |
49.7%
|
| 3 | 3 years or more | 347 |
16.9%
|
| 9 | Unspecified | 2 |
0.1%
|
| Sysmiss | 65428 |