Quarter	Billions of US Dollars
1987-01-01	1.1816
1987-04-01	1.1735
1987-07-01	1.1726
1987-10-01	1.6161
1988-01-01	1.9014
1988-04-01	1.8028
1988-07-01	1.9850
1988-10-01	2.3691
1989-01-01	2.6366
1989-04-01	2.6057
1989-07-01	2.9623
1989-10-01	3.1708
1990-01-01	3.3319
1990-04-01	3.5111
1990-07-01	3.9680
1990-10-01	4.4530
1991-01-01	4.2051
1991-04-01	4.1672
1991-07-01	4.5095
1991-10-01	5.7359
1992-01-01	5.8991
1992-04-01	6.3199
1992-07-01	6.9119
1992-10-01	6.3233
1993-01-01	7.6932
1993-04-01	8.4435
1993-07-01	9.9107
1993-10-01	9.9832
1994-01-01	11.4635
1994-04-01	12.0720
1994-07-01	12.8036
1994-10-01	13.3989
1995-01-01	14.6345
1995-04-01	15.6844
1995-07-01	15.1469
1995-10-01	15.4673
1996-01-01	14.9451
1996-04-01	14.7452
1996-07-01	14.1076
1996-10-01	13.3289
1997-01-01	12.4865
1997-04-01	12.7184
1997-07-01	12.1813
1997-10-01	11.3558
1998-01-01	10.8210
1998-04-01	10.7495
1998-07-01	11.3272
1998-10-01	12.0885
1999-01-01	10.7735
1999-04-01	10.5210
1999-07-01	10.4388
1999-10-01	9.9959
2000-01-01	8.7721
2000-04-01	8.2519
2000-07-01	7.5912
2000-10-01	7.4081
2001-01-01	7.0043
2001-04-01	6.5966
2001-07-01	6.8868
2001-10-01	6.0445
2002-01-01	5.4957
2002-04-01	5.7350
2002-07-01	5.4733
2002-10-01	5.6265
2003-01-01	5.1355
2003-04-01	4.5686
2003-07-01	4.0321
2003-10-01	4.0138
2004-01-01	2.4727
2004-04-01	2.3985
2004-07-01	2.3623
2004-10-01	2.5166
2005-01-01	2.2068
2005-04-01	2.1364
2005-07-01	1.6104
2005-10-01	1.2584
2006-01-01	1.2644
2006-04-01	1.2883
2006-07-01	1.2187
2006-10-01	1.8861
2007-01-01	1.9049
2007-04-01	1.8683
2007-07-01	1.9793
2007-10-01	1.7833
2008-01-01	1.7020
2008-04-01	1.6216
2008-07-01	1.5588
2008-10-01	1.6320
2009-01-01	1.5470
2009-04-01	1.6043
2009-07-01	1.6771
2009-10-01	1.6469
2010-01-01	1.5902
2010-04-01	1.3954
2010-07-01	1.5014
2010-10-01	1.5010
2011-01-01	1.0509
2011-04-01	1.0672
2011-07-01	1.0249
2011-10-01	0.9941
2012-01-01	1.0086
2012-04-01	0.9736
2012-07-01	0.9939
2012-10-01	0.9941
2013-01-01	0.9647
2013-04-01	0.9746
2013-07-01	1.5370
2013-10-01	1.3558
2014-01-01	1.3578
2014-04-01	1.3529
2014-07-01	1.2470
2014-10-01	1.6977
2015-01-01	1.5714
2015-04-01	1.6091