| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not required | 15 |
60%
|
| 2 | 1 to 2 years | 7 |
28%
|
| 3 | 3 to 4 years | 3 |
12%
|
| 4 | 5 years and above | 0 |
0%
|
| Sysmiss | 15794 |