Quarter	Billions of US Dollars
1999-01-01	13407.222
1999-04-01	13081.072
1999-07-01	13620.089
1999-10-01	13070.928
2000-01-01	12612.074
2000-04-01	12805.698
2000-07-01	11944.752
2000-10-01	12951.656
2001-01-01	12448.048
2001-04-01	12126.453
2001-07-01	13230.988
2001-10-01	13034.437
2002-01-01	13023.631
2002-04-01	15083.935
2002-07-01	15115.791
2002-10-01	16272.766
2003-01-01	17165.476
2003-04-01	18332.224
2003-07-01	18786.201
2003-10-01	20492.882
2004-01-01	20229.802
2004-04-01	20405.095
2004-07-01	21080.030
2004-10-01	23459.914
2005-01-01	22682.687
2005-04-01	21751.245
2005-07-01	21840.901
2005-10-01	21600.310
2006-01-01	22568.933
2006-04-01	24055.947
2006-07-01	24175.416
2006-10-01	25361.623
2007-01-01	26037.075
2007-04-01	26868.491
2007-07-01	28506.335
2007-10-01	30199.804
2008-01-01	33088.493
2008-04-01	33343.610
2008-07-01	30747.281
2008-10-01	30657.075
2009-01-01	29826.963
2009-04-01	32040.875
2009-07-01	33424.431
2009-10-01	33087.657
2010-01-01	31343.779
2010-04-01	28923.106
2010-07-01	32391.953
2010-10-01	32044.551
2011-01-01	34221.152
2011-04-01	35243.079
2011-07-01	33248.769
2011-10-01	32264.734
2012-01-01	33974.176
2012-04-01	32447.505
2012-07-01	33608.801
2012-10-01	34497.870
2013-01-01	33623.733
2013-04-01	34435.881
2013-07-01	35412.162
2013-10-01	36176.731
2014-01-01	36745.150
2014-04-01	36885.017
2014-07-01	34202.093
2014-10-01	33426.303
2015-01-01	30702.725
2015-04-01	31399.002
2015-07-01	31661.090
2015-10-01	30759.812
2016-01-01	32665.108
2016-04-01	32220.278
2016-07-01	32402.993
2016-10-01	30478.157
2017-01-01	31005.920
2017-04-01	33178.462
2017-07-01	34325.567
2017-10-01	34907.989
2018-01-01	36141.686