You are the one who chose the 1980's as the cut-off for the tax rates. Now you are changing your argument. And, as usual, you failed to comment on the main point--that higher tax rates 50's-70's raised less federal revenue as a percentage of GDP than the lower tax rates. How would you give all those new benefits with less revenue.
Since you used the 80's as the cut-off point, I didn't calculate the averages for later years. Bush's tax cuts did not have much an effect but the recession did. However, if we look at recent data:
2015: 17.9%
2016: 17.4%
2017: 17.0%
The much lower tax rate rates of recent years raised as much or more revenue as a percent of GDP than the 70-91% rates of the 50's-60's-70's.
So you did it again!
You deliberately exclude data because it completely undermines your case!
Why do you do that? Is it just because you don't want to have to eat shit? Because that's what it looks like.