| Value | Category | Cases | |
|---|---|---|---|
| 1 | Up to 6 months | 134 |
17.7%
|
| 2 | 6 months to 1 year | 54 |
7.2%
|
| 3 | 1 year to 2 years | 84 |
11.1%
|
| 4 | More than 2 years | 262 |
34.7%
|
| 8 | Don’t know | 221 |
29.3%
|