Quarter	Billions of US Dollars
1993-01-01	32.956
1993-04-01	33.804
1993-07-01	36.186
1993-10-01	35.644
1994-01-01	37.197
1994-04-01	40.220
1994-07-01	41.801
1994-10-01	43.403
1995-01-01	47.302
1995-04-01	47.808
1995-07-01	48.362
1995-10-01	48.351
1996-01-01	49.514
1996-04-01	51.354
1996-07-01	53.359
1996-10-01	54.022
1997-01-01	57.294
1997-04-01	53.295
1997-07-01	52.436
1997-10-01	51.094
1998-01-01	51.982
1998-04-01	52.799
1998-07-01	56.767
1998-10-01	55.080
1999-01-01	48.080
1999-04-01	48.684
1999-07-01	51.947
1999-10-01	47.508
2000-01-01	43.713
2000-04-01	44.759
2000-07-01	42.837
2000-10-01	45.542
2001-01-01	45.361
2001-04-01	46.017
2001-07-01	44.852
2001-10-01	46.122
2002-01-01	47.507
2002-04-01	57.803
2002-07-01	56.645
2002-10-01	59.775
2003-01-01	60.588
2003-04-01	62.688
2003-07-01	62.453
2003-10-01	66.506
2004-01-01	64.373
2004-04-01	66.585
2004-07-01	69.694
2004-10-01	80.182
2005-01-01	79.867
2005-04-01	76.837
2005-07-01	78.929
2005-10-01	79.769
2006-01-01	86.966
2006-04-01	93.901
2006-07-01	95.107
2006-10-01	108.358
2007-01-01	109.575
2007-04-01	111.689
2007-07-01	126.999
2007-10-01	146.755
2008-01-01	169.023
2008-04-01	186.303
2008-07-01	171.438
2008-10-01	158.560
2009-01-01	147.502
2009-04-01	167.801
2009-07-01	179.992
2009-10-01	172.485
2010-01-01	168.244
2010-04-01	153.907
2010-07-01	180.144
2010-10-01	173.466
2011-01-01	187.750
2011-04-01	197.640
2011-07-01	182.428
2011-10-01	172.519
2012-01-01	186.635
2012-04-01	171.750
2012-07-01	182.885
2012-10-01	191.964
2013-01-01	185.414
2013-04-01	193.804
2013-07-01	205.399
2013-10-01	200.963
2014-01-01	199.619
2014-04-01	198.736
2014-07-01	183.244
2014-10-01	176.281
2015-01-01	159.552
2015-04-01	168.146
2015-07-01	169.490
2015-10-01	165.481
2016-01-01	172.695
2016-04-01	170.952
2016-07-01	175.318
2016-10-01	166.803
2017-01-01	170.572
2017-04-01	189.369
2017-07-01	199.218
2017-10-01	209.418
2018-01-01	218.405