| Value | Category | Cases | |
|---|---|---|---|
| 1 | Purchased | 91 |
2%
|
| 2 | Constructed | 3336 |
73.7%
|
| 3 | Inherited | 956 |
21.1%
|
| 4 | Other | 142 |
3.1%
|
| Sysmiss | 2238 |