Quarter	Billions of US Dollars
1992-01-01	16.114
1992-04-01	17.017
1992-07-01	17.309
1992-10-01	15.476
1993-01-01	15.430
1993-04-01	15.396
1993-07-01	14.730
1993-10-01	14.544
1994-01-01	14.933
1994-04-01	15.398
1994-07-01	15.533
1994-10-01	15.957
1995-01-01	17.394
1995-04-01	19.070
1995-07-01	20.052
1995-10-01	21.674
1996-01-01	22.141
1996-04-01	22.861
1996-07-01	24.562
1996-10-01	26.506
1997-01-01	27.040
1997-04-01	27.229
1997-07-01	28.222
1997-10-01	29.203
1998-01-01	31.575
1998-04-01	33.104
1998-07-01	34.495
1998-10-01	37.100
1999-01-01	34.777
1999-04-01	37.088
1999-07-01	38.256
1999-10-01	39.447
2000-01-01	40.887
2000-04-01	42.986
2000-07-01	41.386
2000-10-01	46.117
2001-01-01	47.798
2001-04-01	49.717
2001-07-01	49.258
2001-10-01	51.562
2002-01-01	49.535
2002-04-01	51.674
2002-07-01	51.844
2002-10-01	55.088
2003-01-01	53.992
2003-04-01	56.135
2003-07-01	56.813
2003-10-01	60.710
2004-01-01	59.961
2004-04-01	62.830
2004-07-01	66.874
2004-10-01	78.829
2005-01-01	77.097
2005-04-01	75.512
2005-07-01	79.918
2005-10-01	81.626
2006-01-01	85.208
2006-04-01	92.482
2006-07-01	100.100
2006-10-01	114.205
2007-01-01	122.639
2007-04-01	138.189
2007-07-01	156.906
2007-10-01	179.908
2008-01-01	211.615
2008-04-01	236.464
2008-07-01	228.357
2008-10-01	203.175
2009-01-01	182.351
2009-04-01	203.085
2009-07-01	222.420
2009-10-01	225.842
2010-01-01	224.601
2010-04-01	202.191
2010-07-01	235.421
2010-10-01	236.148
2011-01-01	251.635
2011-04-01	268.871
2011-07-01	240.384
2011-10-01	232.938
2012-01-01	257.039
2012-04-01	241.572
2012-07-01	257.447
2012-10-01	263.412
2013-01-01	250.450
2013-04-01	251.708
2013-07-01	268.912
2013-10-01	279.605
2014-01-01	283.563
2014-04-01	288.240
2014-07-01	270.094
2014-10-01	254.942
2015-01-01	242.715
2015-04-01	251.919
2015-07-01	252.866
2015-10-01	245.786
2016-01-01	260.156
2016-04-01	248.792
2016-07-01	259.487
2016-10-01	241.756
2017-01-01	257.179
2017-04-01	278.388
2017-07-01	286.212
2017-10-01	299.067
2018-01-01	309.179