There's what you say it said. And there's what it said.
"As you can see, the swings are fairly dramatic. De Rugy's chart purports to show that reducing the top marginal tax rate produced no real change in revenue. But of course the first Reagan tax cuts in 1981 caused revenue to plummet. The top marginal tax rate was also reduced in 1986, but that was accompanied by equally large reductions in tax expenditures, and the whole reform was not designed to reduce revenue.
Meanwhile, the tax hikes by George W. Bush and Bill Clinton -- which supply-siders claimed would not increase revenue -- were followed by a massive spike in revenue. And then the tax cuts by George W. Bush -- which supply-siders claimed would not reduced revenue by very much -- were followed by a massive, 5% of GDP drop in revenue"