Quarter	Billions of US Dollars
2006-10-01	4.432
2007-01-01	4.401
2007-04-01	4.353
2007-07-01	4.752
2007-10-01	4.175
2008-01-01	4.710
2008-04-01	4.979
2008-07-01	4.376
2008-10-01	4.233
2009-01-01	3.982
2009-04-01	4.471
2009-07-01	4.768
2009-10-01	7.062
2010-01-01	6.875
2010-04-01	6.193
2010-07-01	7.196
2010-10-01	9.203
2011-01-01	9.989
2011-04-01	10.244
2011-07-01	9.413
2011-10-01	9.965
2012-01-01	10.728
2012-04-01	9.759
2012-07-01	10.287
2012-10-01	14.637
2013-01-01	13.896
2013-04-01	14.058
2013-07-01	14.638
2013-10-01	15.620
2014-01-01	15.614
2014-04-01	15.460
2014-07-01	14.220
2014-10-01	14.906
2015-01-01	13.303