The Fed decides how much money should be printed annually. In 2010, $974 million was printed. In contrast, $30 billion of Monopoly board-game money is printed each year.
Sources: The Children's Museum of Indianapolis, U.S. News & World Report, FDIC.gov, Bloomberg Businessweek, Yahoo! and Babson College Finance Professor John C. Edmunds, CNBC, Federal Reserve Bank of Minneapolis, Sverigas Riksbank.