why are you comparing TAX REVENUE not INCOME over time?

The tax rate is not constant over time, so really it seems this proves very little, right? e.g. maybe the worker in the USA is going much better than in Europe since his taxes are so much lower, and his income is so much higher. (not saying this is true, just saying that it COULD be true if we just look at your graphs.

I am confused why you are showing tax rates at all....