| Value | Category | Cases | |
|---|---|---|---|
| 1 | less than one year | 23732 |
5.2%
|
| 2 | one to three years | 71724 |
15.6%
|
| 3 | more than three years | 363177 |
79.2%
|
| 4 | not known | 0 |
0%
|