 American currency has been circulating globally for most of the 20th century, and the amount of currency in circulation increased several-fold during World War II.Large-scale printing of the United States one hundred-dollar bill began when the Soviet Union dissolved in 1991; production quadrupled, with the first trillion-dollar printing of the bill.At the end of 2008, U.S. currency in public circulation amounted to $824 billion and 76 percent of the currency supply was in the form of $100 bills (twenty $100 bills per U.S. citizen).