Quarter	Billions of US Dollars
1997-10-01	12381.968
1998-01-01	12095.523
1998-04-01	11612.737
1998-07-01	12001.537
1998-10-01	14054.944
1999-01-01	13445.868
1999-04-01	13316.925
1999-07-01	15278.298
1999-10-01	15974.256
2000-01-01	15875.191
2000-04-01	15539.550
2000-07-01	15097.702
2000-10-01	14337.676
2001-01-01	13324.768
2001-04-01	13408.060
2001-07-01	13818.788
2001-10-01	12593.045
2002-01-01	12419.891
2002-04-01	13917.434
2002-07-01	13441.395
2002-10-01	13793.550
2003-01-01	13869.531
2003-04-01	13637.302
2003-07-01	14631.998
2003-10-01	15238.012
2004-01-01	15846.020
2004-04-01	15085.607
2004-07-01	14768.091
2004-10-01	16007.951
2005-01-01	15510.765
2005-04-01	14926.596
2005-07-01	14540.643
2005-10-01	14026.914
2006-01-01	13949.815
2006-04-01	14203.562
2006-07-01	13865.526
2006-10-01	13751.741
2007-01-01	13839.616
2007-04-01	13116.784
2007-07-01	14100.455
2007-10-01	14600.758
2008-01-01	16442.599
2008-04-01	15440.442
2008-07-01	15451.610
2008-10-01	18207.268
2009-01-01	16716.970
2009-04-01	17318.823
2009-07-01	18605.497
2009-10-01	18100.225
2010-01-01	17965.137
2010-04-01	19122.463
2010-07-01	20400.356
2010-10-01	20977.922
2011-01-01	20518.089
2011-04-01	21295.432
2011-07-01	22464.293
2011-10-01	22508.705
2012-01-01	21364.912
2012-04-01	22118.622
2012-07-01	22812.057
2012-10-01	20677.116
2013-01-01	19050.082
2013-04-01	18165.039
2013-07-01	18590.324
2013-10-01	17433.037
2014-01-01	17751.347
2014-04-01	18218.305
2014-07-01	16932.961
2014-10-01	15860.320
2015-01-01	15839.206
2015-04-01	15486.497
2015-07-01	15834.446
2015-10-01	15976.703
2016-01-01	17432.639
2016-04-01	19378.254
2016-07-01	19624.398
2016-10-01	16980.613
2017-01-01	17806.817
2017-04-01	17846.320
2017-07-01	17831.552
2017-10-01	17958.798
2018-01-01	19019.932