| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than a year | 631 |
31%
|
| 2 | 1 year to less than 3 years | 1066 |
52.3%
|
| 3 | 3 years or more | 330 |
16.2%
|
| 9 | Unspecified | 10 |
0.5%
|
| Sysmiss | 64620 |