Far from the worst graph ever, but you notice the difficulty in measuring the impact of a change in the economy. GDP is simply a constant by which you are measuring the two variables. Revenues did increase last year by like 4% (about equal to nominal GDP growth) but you expect that in a growing economy. You don’t care so much about GDP or its growth, what you care about is you financial situation (revs vs expenses). As you pointed out, moving in opposite directions is bad. As the saying goes, when you find yourself in a hole, first stop digging. Unfortunately every candidate regardless of party brings another shovel and promises to dig their way out. It’s insane.I've stayed out of it but this is one of the worst graphs in the history of graphs.
If you cut the tax rate then taxes are going to be a smaller percentage of GDP. It's a fact. How you could have it work otherwise I have no idea.
What that graph doesn't tell you at all is that GDP grew enough that revenues actually were up slightly overall.
What that graph actually does tell you is that government spending is completely out of hand and has actually gotten worse under Trump instead of better.