How Large Is The Federal Beer Tax

I didn't know, though had a memory of it being raised under the reign of George I. The internet tells me it was doubled, and is now $18 per 31 gallon barrel. What was interesting to me was that smaller producers catch a break, and only pay $7 per barrel. I wonder which influential senator with a craft brewery constituency slipped that one in there. Breaks for the little guys usually don't happen.