The U.S. trade deficit rose to a 15-month high as rising oil prices pushed crude oil imports to the highest level since the fall of 2008, the Commerce Department said on Wednesday. The Commerce Department said that the trade deficit rose 2.5 percent to $40.4 billion in March. It was close to the $40.1 billion deficit economists had expected and the biggest monthly trade deficit since December 2008. Exports of goods and services rose 3.2 percent to $147.87 billion, the highest level since October 2008. Imports were up 3.1 percent to $188.3 billion. The higher deficit is evidence of an improving economy. It shows demand is picking up in the United States following the recession, which had cut the trade gap last year to the lowest level in eight years. So far this year, the deficit is running at an annual rate of $467.2 billion, 23.4 percent higher than last year's imbalance of $378.6 billion. For March, the rise in exports reflected increased sales of American farm products and a wide range of heavy machinery from electric generators to earth-moving equipment. The increase in imports was led by a 25.5 percent jump in crude oil shipments, which rose to $22.3 billion March, the highest level since October 2008. That increase reflected higher volume and higher prices. The average price for a barrel of crude oil rose to $74.32, up from $72.92 in February. Prices have been falling since oil hit $87.15 a barrel in early May. The debt crisis in Europe has raised concerns about the durability of the global economic recovery. In trading Wednesday, oil dipped to near $76 per barrel. Treasury Secretary Timothy Geithner raised hopes for a change in monetary policy when he stopped in Beijing last month to talk with Chinese economic officials on his way back from India. But Chinese President Hu Jintao, who discussed the issue with U.S. President Barack Obama during a trip to Washington last month, said China's decision on the currency "won't be advanced by any foreign pressure." American manufacturers are pressing for a tougher trade policy. They said America's trade deficit with China has cost 2.4 million manufacturing jobs at a time when the jobless rate in this country is 9.9 percent. Geithner is expected to raise the currency issue when he and Secretary of State Hillary Clinton go to China for two days of high-level talks later this month.