| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 2 |
5.3%
|
| 2 | 1 to 2 years | 4 |
10.5%
|
| 3 | 3 to 5 years | 16 |
42.1%
|
| 4 | More than 5 years | 16 |
42.1%
|
| 11 | .C | 64 |