Quarter	Billions of US Dollars
1998-07-01	0.02429
2004-01-01	0.01931
2004-04-01	0.09314
2004-10-01	0.26814
2005-01-01	0.76893
2005-04-01	0.99416
2005-07-01	2.20965
2005-10-01	1.10535
2006-01-01	1.21673
2006-04-01	0.51384
2006-07-01	1.33003
2006-10-01	1.74018
2007-01-01	3.17645
2007-04-01	4.10761
2007-07-01	1.07835
2007-10-01	0.79707
2008-01-01	1.79319
2008-04-01	1.60220
2008-07-01	1.08247
2008-10-01	0.37017
2009-01-01	0.22569
2009-04-01	0.75758
2009-07-01	1.94102
2009-10-01	1.63827
2010-01-01	2.89385
2010-04-01	3.78603
2010-07-01	4.67459
2010-10-01	5.41013
2011-01-01	5.22162
2011-04-01	7.32407
2011-07-01	4.83310
2011-10-01	1.46366
2012-01-01	1.48361
2012-04-01	4.41612
2012-07-01	3.71721
2012-10-01	3.42390
2013-01-01	3.76946
2013-04-01	3.26355
2013-07-01	3.29233
2013-10-01	2.13274
2014-01-01	2.16352
2014-04-01	4.43672
2014-07-01	3.04001
2014-10-01	1.70323
2015-01-01	2.48818
2015-04-01	1.16546