Dont have a percentage,but it's pretty high.A average year I take about a dozen deer,20 few hogs,600LBS of catfish-flathead,bream,crappie,With alittle luck of the draw a Gator or 2.Might buy a small beef to mix the burger with the deer burger.
The garden takes care of a good bit of the other.We do some trading with a few familys for other garden goods for meat that dont hunt or cant hunt.
Been pretty lucky over the years to be able to give to feed the hungry & other church groups,Fish fries,BBQ'S now & then.