Quarter	Billions of US Dollars
1998-10-01	76.238
1999-01-01	69.495
1999-04-01	65.850
1999-07-01	66.093
1999-10-01	61.518
2000-01-01	60.409
2000-04-01	58.424
2000-07-01	55.469
2000-10-01	58.622
2001-01-01	55.464
2001-04-01	52.718
2001-07-01	57.156
2001-10-01	55.865
2002-01-01	52.771
2002-04-01	61.302
2002-07-01	62.490
2002-10-01	67.855
2003-01-01	72.720
2003-04-01	79.546
2003-07-01	78.225
2003-10-01	85.568
2004-01-01	79.611
2004-04-01	80.731
2004-07-01	84.522
2004-10-01	96.949
2005-01-01	84.024
2005-04-01	81.647
2005-07-01	79.162
2005-10-01	81.869
2006-01-01	76.840
2006-04-01	85.376
2006-07-01	79.281
2006-10-01	88.505
2007-01-01	85.443
2007-04-01	87.931
2007-07-01	85.873
2007-10-01	94.846
2008-01-01	99.187
2008-04-01	98.662
2008-07-01	80.950
2008-10-01	91.645
2009-01-01	98.674
2009-04-01	94.107
2009-07-01	106.171
2009-10-01	113.182
2010-01-01	112.093
2010-04-01	110.720
2010-07-01	122.184
2010-10-01	123.608
2011-01-01	127.431
2011-04-01	131.976
2011-07-01	132.725
2011-10-01	132.826
2012-01-01	139.977
2012-04-01	142.884
2012-07-01	145.101
2012-10-01	154.766
2013-01-01	152.957
2013-04-01	159.596
2013-07-01	156.562
2013-10-01	165.726
2014-01-01	173.433
2014-04-01	178.057
2014-07-01	164.449
2014-10-01	165.266
2015-01-01	153.157
2015-04-01	158.535
2015-07-01	155.697
2015-10-01	157.213
2016-01-01	168.777
2016-04-01	161.464
2016-07-01	162.492
2016-10-01	156.467
2017-01-01	158.696
2017-04-01	165.810
2017-07-01	168.322
2017-10-01	174.487
2018-01-01	176.281