| Value | Category | Cases | |
|---|---|---|---|
| 1 | < 2 years | 21562 |
38.6%
|
| 2 | 2 years | 12527 |
22.4%
|
| 3 | 3 years | 4915 |
8.8%
|
| 4 | 4+ years | 5656 |
10.1%
|
| Sysmiss | 11163 |