| Value | Category | 
|---|---|
| 1 | Parents support | 
| 2 | Loans | 
| 3 | Remittance from abroad | 
| 4 | Proceeds from family farm | 
| 5 | Proceeds from family non-farm enterprise | 
| 6 | Income from family property | 
| 7 | Association support | 
| 8 | Church associations | 
| 9 | Relatives and friends | 
| 96 | |
| 99 | Other | 
| Sysmiss |