| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1 year | 6 |
2.4%
|
| 2 | 2 years | 17 |
6.7%
|
| 3 | 3 years | 17 |
6.7%
|
| 4 | 4 years | 11 |
4.3%
|
| 5 | 5 years | 4 |
1.6%
|
| 6 | 6-10 years | 12 |
4.7%
|
| 7 | 11-20 years | 22 |
8.6%
|
| 8 | 20+ years | 40 |
15.7%
|
| 9 | 126 |
49.4%
|
|
| Sysmiss | 27 |