In the past, according to this article by Wendy Stein, insurers have spent about 74% of total premiums for individual plans on care, 80% for small groups, and 84% for big employer coverage.
In a 2006 article for the Journal of Urban Economics, Clifford Winston and Ashley Langer crunched the numbers on highway spending in 74 of the largest U.S. cities from 1982 to 1996.