Since DuPont uses oil as a raw material to make plastics and burns natural gas as a fuel to make its products, significant fluctuations in oil or natural gas prices will impact the company's profits. Widespread commodity price increases have led DuPont to preemptively raise prices for many products. In some cases increased raw materials costs can be passed on to consumers, but in other cases the company is not so fortunate. For example, in 2008 the Performance Materials segment reported a 3% decrease in sales after increasing prices by 11% because of a 13% decrease in sales volume. After Hurricane Katrina in 2005, DuPont raised prices on 35,000 products to counter the increasing price of oil and other raw inputs.