Last year?
The ACES tax is a sliding scale, it continuous to increase in percentage as the oil price increases. It does not have an inflation allowances so as time goes on, and prices rises along with the deflated value of the dollar, the rate continues to increase.
The article was from a while back.
If Obama gets a second term he might not be able to enact a windfall tax, but he could do worse and send his shock troops (EPA BLM) out and close off land and stop Fracking.