Quarter	Billions of US Dollars
1987-01-01	0.00900
2002-10-01	0.03146
2003-01-01	0.03269
2003-04-01	0.03428
2003-07-01	0.03496
2003-10-01	0.03789
2004-01-01	0.03667
2004-04-01	0.03646
2004-07-01	0.03723
2004-10-01	0.10897
2005-01-01	0.10371
2005-04-01	0.09674
2005-07-01	0.09634
2005-10-01	0.09438
2006-01-01	0.09683
2006-04-01	0.10170
2006-07-01	0.10128
2006-10-01	0.10536
2007-01-01	0.26636
2007-04-01	0.27010
2007-07-01	0.28358
2007-10-01	0.44163
2008-01-01	0.47436
2008-04-01	0.47292
2008-07-01	0.42909
2008-10-01	0.41751
2009-01-01	0.39924
2009-04-01	0.42402
2009-07-01	3.36789
2009-10-01	3.19813
2010-01-01	2.99234
2010-04-01	3.88990
2010-07-01	4.32642
2010-10-01	4.30256
2011-01-01	5.07190
2011-04-01	5.15972
2011-07-01	4.82057
2011-10-01	4.61922
2012-01-01	4.76809
2012-04-01	4.49463
2012-07-01	2.03001
2012-10-01	2.07146
2013-01-01	2.26648
2013-04-01	2.31516
2013-07-01	2.27128
2013-10-01	2.31938
2014-01-01	2.31888
2014-04-01	2.42927
2014-07-01	2.61555
2014-10-01	2.46297
2015-01-01	2.18261
2015-04-01	0.81528