| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than one year | 19 |
2.6%
|
| 2 | 1-2 years | 67 |
9.1%
|
| 3 | 3-5 years | 59 |
8%
|
| 4 | More than 5 years | 593 |
80.4%
|
| Sysmiss | 12145 |