Quarter	Billions of US Dollars
2002-01-01	8.668
2002-04-01	9.801
2002-07-01	9.733
2002-10-01	10.852
2003-01-01	10.737
2003-04-01	12.066
2003-07-01	12.101
2003-10-01	14.093
2004-01-01	13.944
2004-04-01	14.176
2004-07-01	14.763
2004-10-01	16.663
2005-01-01	16.107
2005-04-01	15.542
2005-07-01	16.082
2005-10-01	16.113
2006-01-01	17.068
2006-04-01	18.470
2006-07-01	18.809
2006-10-01	20.204
2007-01-01	22.500
2007-04-01	23.669
2007-07-01	25.634
2007-10-01	27.545
2008-01-01	30.177
2008-04-01	30.937
2008-07-01	29.068
2008-10-01	28.076
2009-01-01	26.891
2009-04-01	29.234
2009-07-01	30.797
2009-10-01	30.633
2010-01-01	28.879
2010-04-01	26.832
2010-07-01	30.413
2010-10-01	30.665
2011-01-01	33.329
2011-04-01	34.561
2011-07-01	32.678
2011-10-01	31.875
2012-01-01	33.205
2012-04-01	32.215
2012-07-01	33.596
2012-10-01	35.010
2013-01-01	34.414
2013-04-01	35.694
2013-07-01	37.075
2013-10-01	38.175
2014-01-01	39.303
2014-04-01	39.561
2014-07-01	37.443
2014-10-01	36.408
2015-01-01	33.298
2015-04-01	33.994
2015-07-01	35.401
2015-10-01	34.073
2016-01-01	35.993
2016-04-01	35.539
2016-07-01	37.956
2016-10-01	36.472
2017-01-01	37.976
2017-04-01	41.493
2017-07-01	43.011
2017-10-01	44.364
2018-01-01	45.961