It's getting more expensive for Americans to get their caffeine fix. U.S. government figures show the average price of a pound of ground coffee hit $9.14 in September, a 41% increase from the same month a year earlier. Coffee prices have been rising sharply since the start of this year. Tariffs are partly to blame. The U.S. imports 99% of its coffee. Its biggest provider is Brazil, which is currently subject to a 50% tariff. A bipartisan group of U.S. House members introduced a bill last month that would exempt coffee from U.S. tariffs. But there's been no action on the bill due to the government shutdown.