Quarter	Billions of US Dollars
1989-07-01	3.236
1989-10-01	3.169
1990-01-01	4.013
1990-04-01	5.482
1990-07-01	6.875
1990-10-01	9.037
1991-01-01	10.542
1991-04-01	11.523
1991-07-01	15.826
1991-10-01	15.794
1992-01-01	18.635
1992-04-01	18.797
1992-07-01	15.507
1992-10-01	12.615
1993-01-01	11.091
1993-04-01	12.232
1993-07-01	8.875
1993-10-01	9.504
1994-01-01	11.405
1994-04-01	13.601
1994-07-01	14.051
1994-10-01	13.642
1995-01-01	15.362
1995-04-01	17.624
1995-07-01	18.813
1995-10-01	20.514
1996-01-01	20.457
1996-04-01	19.256
1996-07-01	18.975
1996-10-01	20.491
1997-01-01	20.883
1997-04-01	19.160
1997-07-01	20.776
1997-10-01	23.947
1998-01-01	22.382
1998-04-01	20.114
1998-07-01	24.051
1998-10-01	31.769
1999-01-01	53.284
1999-04-01	56.734
1999-07-01	87.494
1999-10-01	102.872
2000-01-01	113.248
2000-04-01	127.967
2000-07-01	123.982
2000-10-01	145.943
2001-01-01	143.549
2001-04-01	122.683
2001-07-01	116.228
2001-10-01	107.915
2002-01-01	116.518
2002-04-01	126.792
2002-07-01	145.428
2002-10-01	157.720
2003-01-01	190.022
2003-04-01	205.830
2003-07-01	194.994
2003-10-01	233.340
2004-01-01	236.597
2004-04-01	235.947
2004-07-01	254.830
2004-10-01	285.280
2005-01-01	296.033
2005-04-01	281.005
2005-07-01	278.653
2005-10-01	260.357
2006-01-01	291.776
2006-04-01	335.504
2006-07-01	337.044
2006-10-01	334.604
2007-01-01	399.493
2007-04-01	441.468
2007-07-01	467.276
2007-10-01	454.665
2008-01-01	586.767
2008-04-01	618.170
2008-07-01	557.850
2008-10-01	481.863
2009-01-01	452.678
2009-04-01	449.795
2009-07-01	487.247
2009-10-01	400.664
2010-01-01	398.277
2010-04-01	360.529
2010-07-01	391.968
2010-10-01	341.293
2011-01-01	366.741
2011-04-01	350.240
2011-07-01	347.851
2011-10-01	338.708
2012-01-01	429.736
2012-04-01	380.731
2012-07-01	347.977
2012-10-01	315.363
2013-01-01	297.823
2013-04-01	306.824
2013-07-01	317.955
2013-10-01	314.254
2014-01-01	306.723
2014-04-01	316.156
2014-07-01	304.205
2014-10-01	284.353
2015-01-01	288.028
2015-04-01	303.179