Relative to workers' payroll tax, corporate taxes have dropped from $1.00 to 7 cents.

In 1953, as the most productive era in U.S. history was beginning, corporations contributed over a dollar for every 33 cents paid by workers. In 2011, the corporate contribution was about 7 cents for every 33 cents paid by workers.
For those who believe that entitlements are the problem, Urban Institute figures should help them reconsider. The typical two-earner couple making average wages throughout their lifetimes will receive less in Social Security benefits than they paid in. Same for single males. Almost the same for single females.

http://www.nationofchange.org/four-contemptible-examples-corporate-tax-avoidance-1373297031