Quarter Billions of US Dollars 2003-01-01 0.50000 2003-04-01 0.25000 2008-01-01 -0.15000 2008-04-01 -0.25000 2009-04-01 0.75000 2010-01-01 1.25000 2010-04-01 0.75000 2011-10-01 0.75000 2012-07-01 1.50000 2012-10-01 0.09627 2013-01-01 -0.35000 2013-04-01 0.04929 2013-07-01 1.50000 2014-04-01 -0.75000 2014-07-01 1.25000 2015-04-01 -0.75000