| Value | Category | Cases | |
|---|---|---|---|
| 1 | Not required | 131 |
62.7%
|
| 2 | 1 to 2 years | 60 |
28.7%
|
| 3 | 3 to 4 years | 12 |
5.7%
|
| 4 | 5 years and above | 6 |
2.9%
|
| Sysmiss | 15610 |