An estate planner and I were talking about what percentage of people die in their own homes versus hospitals or skilled care and we googled and came up with this article. Although it was written in 1997 it is pretty thorugh and deals with different demographics - such as location, race, education, marital status.
http://findarticles.com/p/articles/mi_m4021/is_n4_v19/ai_19310644/print
"Just 45 percent of deaths to those aged 85 and older took place in a hospital. But these very old were less likely than average to die at home, too, because 39 percent died in a nursing home"