| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 64 |
12.7%
|
| 2 | 1 year | 78 |
15.5%
|
| 3 | 2 years | 106 |
21.1%
|
| 4 | 3 years | 151 |
30.1%
|
| 5 | 4 years | 103 |
20.5%
|
| Sysmiss | 11437 |