12 points
81-89. I don’t think Reagan’s presidency or party really explains it, because we see it rise shortly and then fall, both during Bill Clinton’s presidency (93-2001). So George H.W. Bush raised taxes during his term, and then Clinton cut them again, but did so while balancing the budget (Clinton ran a surplus).
Reagan certainly slashed taxes, but so did Clinton, and to a similar degree.
10 points