Quarter	Billions of US Dollars
1987-01-01	0.58656
1987-04-01	0.57672
1987-07-01	0.66010
1987-10-01	0.73147
1988-01-01	0.78979
1988-04-01	0.64142
1988-07-01	0.60789
1988-10-01	0.71262
1989-01-01	0.59273
1989-04-01	0.57683
1989-07-01	0.62473
1989-10-01	0.63381
1990-01-01	0.56816
1990-04-01	0.47148
1990-07-01	0.45880
1990-10-01	0.46580
1991-01-01	0.43472
1991-04-01	0.42556
1991-07-01	0.45039
1991-10-01	0.46789
1992-01-01	0.45263
1992-04-01	0.39123
1992-07-01	0.37944
1992-10-01	0.37594
1993-01-01	0.37792
1993-04-01	0.37385
1993-07-01	0.38710
1993-10-01	0.29450
1994-01-01	0.31400
1994-04-01	0.15800
1994-07-01	0.04700
1994-10-01	0.04650
1995-01-01	0.03150
1995-04-01	0.02250
1995-07-01	0.08250
1995-10-01	0.07250
1996-01-01	0.07250
1996-04-01	0.07750
1996-07-01	0.12750
1996-10-01	0.12750
1997-01-01	0.14750
1997-04-01	0.14250
1997-07-01	0.34750
1997-10-01	0.34250
1998-01-01	0.33750
1998-04-01	0.34250
1998-07-01	0.26750
1998-10-01	0.26750
1999-01-01	0.26500
1999-04-01	0.27500
1999-07-01	0.27500
1999-10-01	0.27500
2000-01-01	0.27500
2000-04-01	0.28000
2000-07-01	0.27500
2000-10-01	0.27500
2001-01-01	0.27500
2001-04-01	0.27000
2001-07-01	0.22000
2001-10-01	0.24000
2002-01-01	0.22500
2002-04-01	0.54500
2002-07-01	0.33000
2002-10-01	0.32500
2003-01-01	0.32500
2003-04-01	0.33500
2003-07-01	0.34500
2003-10-01	0.34500
2004-01-01	0.35500
2004-04-01	0.34500
2004-07-01	0.32500
2004-10-01	0.33850
2005-01-01	0.35850
2005-04-01	0.33850
2005-07-01	0.75850
2005-10-01	1.24500
2006-01-01	1.74500
2006-04-01	1.74500
2006-07-01	2.05500
2006-10-01	2.13500
2007-01-01	2.13500
2007-04-01	3.38696
2007-07-01	3.38752
2007-10-01	3.35119
2008-01-01	3.37097
2008-04-01	3.34039
2008-07-01	3.21823
2008-10-01	3.09853
2009-01-01	3.09020
2009-04-01	3.16790
2009-07-01	3.12525
2009-10-01	3.66146
2010-01-01	3.61288
2010-04-01	3.08263
2010-07-01	3.08263
2010-10-01	3.19263
2011-01-01	2.69263
2011-04-01	2.67933
2011-07-01	2.37933
2011-10-01	2.80923
2012-01-01	2.38936
2012-04-01	2.37936
2012-07-01	2.37936
2012-10-01	2.88936
2013-01-01	3.24266
2013-04-01	3.24266
2013-07-01	3.24266
2013-10-01	3.84266
2014-01-01	3.89056
2014-04-01	4.17316
2014-07-01	4.34312
2014-10-01	4.07588
2015-01-01	4.38232
2015-04-01	4.65433