Quarter	Billions of US Dollars
1987-01-01	0.963
1987-04-01	0.986
1987-07-01	0.976
1987-10-01	1.110
1988-01-01	1.062
1988-04-01	0.971
1988-07-01	0.942
1988-10-01	0.931
1989-01-01	0.833
1989-04-01	0.816
1989-07-01	0.805
1989-10-01	0.858
1990-01-01	0.864
1990-04-01	1.125
1990-07-01	1.228
1990-10-01	1.265
1991-01-01	1.134
1991-04-01	1.137
1991-07-01	1.271
1991-10-01	1.499
1992-01-01	1.601
1992-04-01	1.587
1992-07-01	1.663
1992-10-01	1.496
1993-01-01	1.740
1993-04-01	2.018
1993-07-01	2.094
1993-10-01	2.186
1994-01-01	2.238
1994-04-01	2.392
1994-07-01	2.829
1994-10-01	3.691
1995-01-01	4.737
1995-04-01	5.971
1995-07-01	7.265
1995-10-01	9.747
1996-01-01	10.325
1996-04-01	11.480
1996-07-01	12.484
1996-10-01	12.940
1997-01-01	12.164
1997-04-01	13.314
1997-07-01	13.749
1997-10-01	13.555
1998-01-01	14.723
1998-04-01	14.470
1998-07-01	15.705
1998-10-01	16.910
1999-01-01	18.420
1999-04-01	19.156
1999-07-01	24.672
1999-10-01	19.928
2000-01-01	30.105
2000-04-01	34.560
2000-07-01	36.450
2000-10-01	39.000
2001-01-01	37.846
2001-04-01	37.046
2001-07-01	43.067
2001-10-01	52.944
2002-01-01	60.412
2002-04-01	69.597
2002-07-01	78.593
2002-10-01	81.923
2003-01-01	97.911
2003-04-01	106.063
2003-07-01	126.194
2003-10-01	138.836
2004-01-01	148.920
2004-04-01	162.453
2004-07-01	181.430
2004-10-01	200.842
2005-01-01	216.817
2005-04-01	221.433
2005-07-01	226.479
2005-10-01	233.794
2006-01-01	257.681
2006-04-01	279.058
2006-07-01	282.483
2006-10-01	304.103
2007-01-01	323.517
2007-04-01	358.089
2007-07-01	378.156
2007-10-01	393.380
2008-01-01	448.193
2008-04-01	452.237
2008-07-01	418.363
2008-10-01	432.989
2009-01-01	438.716
2009-04-01	472.221
2009-07-01	478.471
2009-10-01	472.137
2010-01-01	458.166
2010-04-01	432.025
2010-07-01	452.423
2010-10-01	455.975
2011-01-01	468.027
2011-04-01	486.916
2011-07-01	499.236
2011-10-01	509.656
2012-01-01	522.704
2012-04-01	498.657
2012-07-01	490.102
2012-10-01	499.498
2013-01-01	482.154
2013-04-01	474.880
2013-07-01	488.787
2013-10-01	492.406
2014-01-01	476.017
2014-04-01	484.410
2014-07-01	464.876
2014-10-01	449.926
2015-01-01	430.338
2015-04-01	437.003