Quarter	Billions of US Dollars
1997-10-01	127.283
1998-01-01	120.417
1998-04-01	126.317
1998-07-01	131.592
1998-10-01	135.553
1999-01-01	133.001
1999-04-01	130.673
1999-07-01	128.338
1999-10-01	128.988
2000-01-01	132.976
2000-04-01	138.302
2000-07-01	129.507
2000-10-01	141.386
2001-01-01	136.284
2001-04-01	129.871
2001-07-01	142.075
2001-10-01	147.141
2002-01-01	137.720
2002-04-01	161.367
2002-07-01	167.856
2002-10-01	188.924
2003-01-01	190.338
2003-04-01	208.131
2003-07-01	209.811
2003-10-01	233.376
2004-01-01	235.025
2004-04-01	240.768
2004-07-01	253.121
2004-10-01	283.466
2005-01-01	260.321
2005-04-01	261.010
2005-07-01	264.677
2005-10-01	257.775
2006-01-01	279.452
2006-04-01	290.488
2006-07-01	297.357
2006-10-01	312.090
2007-01-01	324.348
2007-04-01	320.178
2007-07-01	340.960
2007-10-01	362.015
2008-01-01	399.121
2008-04-01	390.832
2008-07-01	367.630
2008-10-01	364.271
2009-01-01	373.038
2009-04-01	421.601
2009-07-01	452.716
2009-10-01	426.282
2010-01-01	404.042
2010-04-01	320.713
2010-07-01	374.939
2010-10-01	356.921
2011-01-01	390.938
2011-04-01	368.842
2011-07-01	326.896
2011-10-01	269.221
2012-01-01	244.969
2012-04-01	264.371
2012-07-01	326.549
2012-10-01	382.409
2013-01-01	368.723
2013-04-01	393.725
2013-07-01	409.290
2013-10-01	423.209
2014-01-01	430.150
2014-04-01	431.939
2014-07-01	394.447
2014-10-01	373.335
2015-01-01	315.957
2015-04-01	326.421
2015-07-01	328.677
2015-10-01	330.196
2016-01-01	341.967
2016-04-01	341.023
2016-07-01	338.616
2016-10-01	325.196
2017-01-01	325.773
2017-04-01	346.971
2017-07-01	364.810
2017-10-01	387.659
2018-01-01	400.932