| Value | Category | Cases | |
|---|---|---|---|
| 1 | Less than 1 year | 23 |
0.7%
|
| 2 | 1 to 3 years | 194 |
6.2%
|
| 3 | 4 to 10 years | 1020 |
32.8%
|
| 4 | 10 to 20 years | 1069 |
34.4%
|
| 5 | Many generations | 806 |
25.9%
|
| Sysmiss | 2205 |