The production peak in 1970 was predicted by one of the two projections put forward in 1956 by Hubbert. By 1972 all import quotas and controls on U.S. domestic production had been removed. Despite this, and despite the quadrupling of prices during the 1973 oil crisis, the production decline was not reversed in the lower 48 states until 2009. Crude oil production has since risen sharply from 2009 through 2014, so that the rate of US oil production in October 2014 was 81% higher than the average rate in 2008.