It's extremely variable on an individual basis. I've had years with 100% survival and then others with 0% survival (small sample of under 10 hives), with other

It's extremely variable on an individual basis. I've had years with 100% survival and then others with 0% survival (small sample of under 10 hives), with other beekeepers experiencing similar losses. There are some studies/surveys out there about survival rates (the population rate studies are less helpful). My understanding is the survival rate plummeted after the introduction of varroa but has been mostly stable around 50% survival nationally for over a decade.