NEW YORK — A research firm is forecasting a bigger decline in personal computer sales in 2015.

International Data Corp. projected Thursday that PC sales would drop 4.9 percent to 293.1 million worldwide. IDC had previously forecast a 3.3 percent drop.

PC sales fell 2.2 percent in 2014.

IDC said it cut its forecast because the stronger U.S. dollar is making computers more expensive in other countries and it expects Microsoft Corp. to scale back subsidies for some products.