| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 6 months | 110 |
6.8%
|
| 2 | 6 months to 12 months | 206 |
12.8%
|
| 3 | 1 to 2 years | 352 |
21.9%
|
| 4 | 2 to 3 years | 279 |
17.3%
|
| 5 | more than 3 years | 662 |
41.1%
|
| Sysmiss | 4832 |