| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Less than 1 year | 0 |
0%
|
| 2 | 2. 1 to 3 years | 50 |
4.7%
|
| 3 | 3. 4 to 10 years | 264 |
24.6%
|
| 4 | 4. 10 to 20 years | 405 |
37.7%
|
| 5 | 5. Many generations | 354 |
33%
|
| Sysmiss | 1874 |