| Value | Category | 
|---|---|
| -5 | other | 
| -4 | missing data | 
| -3 | refused to answer | 
| -2 | not applicable | 
| -1 | do not know | 
| 1 | letting farm property to others | 
| 2 | sales of manure of straw | 
| 3 | hiring out of livestock for draft | 
| 4 | hiring out livestock for stud services | 
| 5 | custom work of machine hire for others | 
| 6 | agricultural subsidies or drought relief payments | 
| 7 | other |