| Value | Category |
|---|---|
| 0 | 0 not defined |
| 1 | 1 income from employment |
| 2 | 2 personal farm |
| 3 | 3 schoarship |
| 4 | 4 pension |
| 5 | 5 allowance |
| 6 | 6 other type of state allowance |
| 7 | 7 savings |
| 8 | 8 earnings from real estate lease |
| 9 | 9 dependcy allowance from others |
| 10 | 10 other source |