| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 6 months | 30 |
10.2%
|
| 2 | 6-12 months | 32 |
10.9%
|
| 3 | 13 months-5 years | 108 |
36.9%
|
| 4 | More than 5 years | 122 |
41.6%
|
| 5 | N/A | 1 |
0.3%
|
| Sysmiss | 344 |