| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than one month | 181 |
8.6%
|
| 2 | 1 to 3 months | 236 |
11.3%
|
| 3 | 4 to 6 months | 221 |
10.5%
|
| 4 | 7 to 12 months | 330 |
15.8%
|
| 5 | 13 to 24 months | 304 |
14.5%
|
| 6 | More than 2 years | 823 |
39.3%
|
| Sysmiss | 161533 |