Quarter	Billions of US Dollars
1998-10-01	55.198
1999-01-01	53.067
1999-04-01	47.528
1999-07-01	47.198
1999-10-01	44.744
2000-01-01	42.250
2000-04-01	41.755
2000-07-01	36.448
2000-10-01	37.328
2001-01-01	35.003
2001-04-01	32.765
2001-07-01	35.965
2001-10-01	35.977
2002-01-01	35.187
2002-04-01	41.710
2002-07-01	43.350
2002-10-01	45.365
2003-01-01	47.807
2003-04-01	52.349
2003-07-01	53.597
2003-10-01	56.579
2004-01-01	57.306
2004-04-01	58.015
2004-07-01	58.298
2004-10-01	62.397
2005-01-01	60.804
2005-04-01	59.533
2005-07-01	58.947
2005-10-01	56.205
2006-01-01	59.189
2006-04-01	60.739
2006-07-01	59.749
2006-10-01	59.814
2007-01-01	62.469
2007-04-01	62.455
2007-07-01	77.934
2007-10-01	70.835
2008-01-01	84.121
2008-04-01	93.287
2008-07-01	102.815
2008-10-01	115.232
2009-01-01	120.355
2009-04-01	143.313
2009-07-01	156.346
2009-10-01	156.056
2010-01-01	175.390
2010-04-01	152.367
2010-07-01	185.693
2010-10-01	176.889
2011-01-01	197.649
2011-04-01	197.659
2011-07-01	247.243
2011-10-01	236.245
2012-01-01	259.770
2012-04-01	253.902
2012-07-01	280.185
2012-10-01	288.180
2013-01-01	294.535
2013-04-01	299.509
2013-07-01	311.311
2013-10-01	315.681
2014-01-01	319.866
2014-04-01	313.271
2014-07-01	292.446
2014-10-01	276.567
2015-01-01	248.057
2015-04-01	250.342
2015-07-01	252.953
2015-10-01	242.991
2016-01-01	261.213
2016-04-01	247.329
2016-07-01	252.623
2016-10-01	233.042
2017-01-01	241.480
2017-04-01	260.046
2017-07-01	269.959
2017-10-01	261.816
2018-01-01	280.656