Quarter	Billions of US Dollars
1997-07-01	19801.891
1997-10-01	19374.343
1998-01-01	19325.423
1998-04-01	19466.384
1998-07-01	20239.525
1998-10-01	21512.167
1999-01-01	20604.585
1999-04-01	20564.718
1999-07-01	21709.275
1999-10-01	22016.948
2000-01-01	21861.809
2000-04-01	21942.092
2000-07-01	21553.755
2000-10-01	21934.453
2001-01-01	21130.102
2001-04-01	21089.814
2001-07-01	21893.424
2001-10-01	21492.530
2002-01-01	21476.809
2002-04-01	23217.099
2002-07-01	23252.646
2002-10-01	24369.721
2003-01-01	24877.211
2003-04-01	25883.568
2003-07-01	26850.720
2003-10-01	28382.823
2004-01-01	28628.613
2004-04-01	28694.315
2004-07-01	29327.136
2004-10-01	31794.802
2005-01-01	31393.489
2005-04-01	31037.611
2005-07-01	31782.410
2005-10-01	32019.569
2006-01-01	33184.298
2006-04-01	34976.589
2006-07-01	35736.254
2006-10-01	37350.353
2007-01-01	38483.836
2007-04-01	39927.287
2007-07-01	42432.838
2007-10-01	44415.636
2008-01-01	47474.853
2008-04-01	48161.785
2008-07-01	46033.416
2008-10-01	45236.184
2009-01-01	44232.477
2009-04-01	46931.596
2009-07-01	48397.925
2009-10-01	48298.547
2010-01-01	48329.230
2010-04-01	47415.533
2010-07-01	50870.566
2010-10-01	51543.690
2011-01-01	53320.981
2011-04-01	54899.366
2011-07-01	53683.318
2011-10-01	54029.611
2012-01-01	55380.976
2012-04-01	54744.043
2012-07-01	56542.631
2012-10-01	57022.835
2013-01-01	56534.103
2013-04-01	56711.283
2013-07-01	58368.107
2013-10-01	58959.541
2014-01-01	59476.261
2014-04-01	60674.478
2014-07-01	58945.431
2014-10-01	57857.576
2015-01-01	56558.427
2015-04-01	58166.060
2015-07-01	57526.314
2015-10-01	57892.636
2016-01-01	60310.723
2016-04-01	60625.696
2016-07-01	61515.035
2016-10-01	59574.749
2017-01-01	61531.282
2017-04-01	63656.142
2017-07-01	65612.330
2017-10-01	67281.107
2018-01-01	69860.478