Quarter	Billions of US Dollars
1987-01-01	0.62291
1987-04-01	0.61058
1987-07-01	0.58106
1987-10-01	0.61875
1988-01-01	0.47946
1988-04-01	0.45844
1988-07-01	0.44952
1988-10-01	0.46078
1989-01-01	0.36859
1989-04-01	0.36586
1989-07-01	0.37028
1989-10-01	0.38019
1990-01-01	0.29324
1990-04-01	0.38237
1990-07-01	0.49242
1990-10-01	0.34705
1991-01-01	0.32875
1991-04-01	0.32152
1991-07-01	0.33188
1991-10-01	0.63353
1992-01-01	0.62124
1992-04-01	0.68783
1992-07-01	0.69604
1992-10-01	0.82234
1993-01-01	0.82232
1993-04-01	0.97078
1993-07-01	1.15330
1993-10-01	1.46661
1994-01-01	1.67190
1994-04-01	2.44540
1994-07-01	3.25245
1994-10-01	3.33031
1995-01-01	2.96758
1995-04-01	2.72529
1995-07-01	2.92082
1995-10-01	2.96208
1996-01-01	2.97615
1996-04-01	2.99239
1996-07-01	2.95588
1996-10-01	2.76257
1997-01-01	2.73500
1997-04-01	3.26998
1997-07-01	3.26253
1997-10-01	3.25725
1998-01-01	3.07269
1998-04-01	2.92506
1998-07-01	2.67299
1998-10-01	2.58007
1999-01-01	2.31366
1999-04-01	2.21152
1999-07-01	2.01152
1999-10-01	2.25927
2000-01-01	2.25927
2000-04-01	2.25690
2000-07-01	2.25690
2000-10-01	2.25440
2001-01-01	2.25440
2001-04-01	2.12678
2001-07-01	2.05967
2001-10-01	1.88190
2002-01-01	1.88190
2002-04-01	1.73649
2002-07-01	1.73649
2002-10-01	1.73343
2003-01-01	1.73343
2003-04-01	1.75093
2003-07-01	1.75092
2003-10-01	1.45119
2004-01-01	1.45119
2004-04-01	1.44093
2004-07-01	1.44093
2004-10-01	1.34028
2005-01-01	1.34028
2005-04-01	1.54169
2005-07-01	1.56669
2005-10-01	1.74669
2006-01-01	1.74669
2006-04-01	1.84669
2006-07-01	1.99669
2006-10-01	1.74669
2007-01-01	1.98303
2007-04-01	2.48792
2007-07-01	2.63542
2007-10-01	3.00630
2008-01-01	3.01717
2008-04-01	3.59108
2008-07-01	3.53343
2008-10-01	3.23824
2009-01-01	2.57168
2009-04-01	2.56765
2009-07-01	2.54588
2009-10-01	3.93752
2010-01-01	4.65031
2010-04-01	4.65138
2010-07-01	4.77172
2010-10-01	5.04042
2011-01-01	5.18818
2011-04-01	5.21222
2011-07-01	5.02431
2011-10-01	4.94919
2012-01-01	5.05558
2012-04-01	4.74481
2012-07-01	5.11488
2012-10-01	6.53355
2013-01-01	6.50049
2013-04-01	6.38597
2013-07-01	6.43090
2013-10-01	5.00554
2014-01-01	6.42931
2014-04-01	8.47709
2014-07-01	8.67577
2014-10-01	8.56932
2015-01-01	8.48267
2015-04-01	8.26001