A lot! Anywhere from $400, 000 to 500, 000 depending on where you practice.
In terms of profit or in terms of production? Or production per acre/hectare or profit per bottle/case/pallet?
The make $40,000 on average.
Although i don't know the exact number of her income one year, but i am sure it is a large amount of money, and it is their secret, so not very easy to get.
I did a dictionary check on "foruner" and found no such word. I suggest you figure out what you really want to ask, and find out how to spell it.