| Value | Category | Cases | |
|---|---|---|---|
| 1 | Collected | 70 |
11.2%
|
| 2 | Purchased | 529 |
84.6%
|
| 3 | Aid agency | 1 |
0.2%
|
| 4 | Other(specify) | 25 |
4%
|
| Sysmiss | 3555 |