| Value | Category | Cases | |
|---|---|---|---|
| 0 | < 1 year | 93 |
36.3%
|
| 1 | 1 to 2 years | 93 |
36.3%
|
| 2 | 3 to 10 years | 49 |
19.1%
|
| 3 | 11 to 20 years | 15 |
5.9%
|
| 4 | more than 20 years | 6 |
2.3%
|
| Sysmiss | 5 |