Federal Tax Revenue as % of GDP
 
Another graph from my work-in-progress folder. I posted this data previously as a simple line graph but I had tried a different approch for the main sources of federal revenue. While these area charts are visually clean and simple they do not support direct comparisons so the year where the social insurance tax receipts crosses over the corporate tax receipts is not very clear.

Data is from the Office of Management and Budget, Historical Tables, Table 2.3