Initial public offerings in 2012 slumped to the lowest level since the financial crisis as signs of an economic slowdown and Facebook Inc.’s disappointing debut curbed demand and prompted companies to push back sales.

IPOs have raised $112 billion worldwide this year, the least since 2008, according to data compiled by Bloomberg. Initial sales in western Europe dropped to one-third of last year’s level, while concern about China’s economy helped cut proceeds in Asia by almost half. U.S. offerings raised $41 billion, little changed from last year, as Facebook’s IPO spurred a monthlong drought in U.S. deals.