During the latter half of the 20th century, what sources of federal tax revenues changed?

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In the latter half of the 20th century, both corporate taxes became a smaller proportion of federal revenues and the proportion of federal revenues drawn from payroll taxes increased. This shift can be attributed to various economic and policy factors, including changes in the composition of the labor force, the growth of the service sector, and the introduction of programs such as Social Security and Medicare which are financed through payroll taxes. Individual income taxes also became a higher proportion of federal revenues, but this is not exclusive to this period as it has been a general trend throughout the 20th century.

During the Latter Half of the 20th Century, What Sources