| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not required | 15 |
68.2%
|
| 2 | 1 to 2 years | 4 |
18.2%
|
| 3 | 3 to 4 years | 3 |
13.6%
|
| 4 | 5 years and above | 0 |
0%
|
| Sysmiss | 15797 |