@bobwyman revenue divided by GDP is a pretty slanted metric to use, though.
Might as well have multiplied by astrological sign or Powerball numbers at that point.
The government doesn't run on GDP, so dividing by that just really doesn't make sense unless a person is trying to sell a story where that statistic conveniently happens to support their rhetoric.
That's not even getting into the issue of the tax reforms applying to previous years where revenue increased. Not only are they choosing a nonsensical statistic, but they are cherry picking only years of the statistic that match their conclusions!