Quarter	Billions of US Dollars
1987-01-01	0.14409
1987-04-01	0.14353
1987-07-01	0.14383
1987-10-01	0.15647
1988-01-01	0.15524
1988-04-01	0.15103
1988-07-01	0.14982
1988-10-01	0.10496
1989-01-01	0.10123
1989-04-01	0.09490
1989-07-01	0.09729
1989-10-01	0.09521
1990-01-01	0.08911
1990-04-01	0.06540
1990-07-01	0.07257
1990-10-01	0.07440
1991-01-01	0.07092
1991-04-01	0.07252
1991-07-01	0.07527
1991-10-01	0.07987
1992-01-01	0.07508
1992-04-01	0.07968
1992-07-01	0.08389
1992-10-01	0.08016
1993-01-01	0.08595
1993-04-01	0.09368
1993-07-01	0.30010
1993-10-01	0.30941
1994-01-01	0.35451
1994-04-01	0.36064
1994-07-01	0.48202
1994-10-01	0.66752
1995-01-01	0.67552
1995-04-01	0.61215
1995-07-01	0.61563
1995-10-01	0.66288
1996-01-01	0.75545
1996-04-01	0.86617
1996-07-01	0.86643
1996-10-01	1.06674
1997-01-01	1.08761
1997-04-01	1.70941
1997-07-01	2.04493
1997-10-01	1.76586
1998-01-01	1.75119
1998-04-01	1.70799
1998-07-01	1.53531
1998-10-01	1.56677
1999-01-01	1.46842
1999-04-01	1.46698
1999-07-01	1.61002
1999-10-01	1.49779
2000-01-01	1.48767
2000-04-01	1.43888
2000-07-01	1.37091
2000-10-01	1.31885
2001-01-01	1.29552
2001-04-01	1.23659
2001-07-01	1.14622
2001-10-01	0.97762
2002-01-01	0.90015
2002-04-01	0.87743
2002-07-01	0.76454
2002-10-01	0.89181
2003-01-01	0.89146
2003-04-01	1.09188
2003-07-01	0.82500
2003-10-01	1.10500
2004-01-01	1.10500
2004-04-01	1.10500
2004-07-01	1.23000
2004-10-01	1.23000
2005-01-01	1.48000
2005-04-01	1.48000
2005-07-01	1.48000
2005-10-01	1.48000
2006-01-01	1.60500
2006-04-01	1.73000
2006-07-01	1.86000
2006-10-01	2.11000
2007-01-01	2.46246
2007-04-01	2.91613
2007-07-01	2.81663
2007-10-01	2.70231
2008-01-01	2.15770
2008-04-01	1.76000
2008-07-01	1.56000
2008-10-01	1.28000
2009-01-01	1.28000
2009-04-01	1.28000
2009-07-01	1.36500
2009-10-01	1.48570
2010-01-01	1.64820
2010-04-01	1.64820
2010-07-01	1.64820
2010-10-01	1.94820
2011-01-01	2.24820
2011-04-01	2.24820
2011-07-01	2.24820
2011-10-01	2.09820
2012-01-01	2.89820
2012-04-01	3.24820
2012-07-01	3.15000
2012-10-01	3.04250
2013-01-01	2.98000
2013-04-01	2.98000
2013-07-01	2.98000
2013-10-01	2.98000
2014-01-01	2.98000
2014-04-01	2.98000
2014-07-01	2.98000
2014-10-01	2.98000
2015-01-01	3.55900
2015-04-01	3.51600