Quarter	Billions of US Dollars
1987-01-01	0.01700
1987-04-01	0.00600
1987-07-01	0.00400
1987-10-01	0.00700
1988-01-01	0.01300
1988-04-01	0.01100
1988-07-01	0.00300
1989-07-01	0.12800
1989-10-01	0.18500
1990-01-01	0.23600
1990-04-01	0.22800
1990-07-01	0.20800
1990-10-01	0.14400
1991-01-01	0.24400
1991-04-01	0.22100
1991-07-01	0.05700
1991-10-01	0.18900
1992-01-01	0.24700
1992-04-01	0.27100
1992-07-01	0.27300
1992-10-01	0.34700
1993-01-01	0.46600
1993-04-01	0.53000
1993-07-01	0.57750
1993-10-01	0.59656
1994-01-01	0.50537
1994-04-01	0.91695
1994-07-01	0.73442
1994-10-01	0.96329
1995-01-01	0.71306
1995-04-01	0.96668
1995-07-01	1.43594
1995-10-01	2.42305
1996-01-01	2.96936
1996-04-01	3.38538
1996-07-01	3.54751
1996-10-01	3.79472
1997-01-01	3.50653
1997-04-01	3.24161
1997-07-01	4.21983
1997-10-01	3.92731
1998-01-01	6.51635
1998-04-01	6.72655
1998-07-01	4.57311
1998-10-01	3.58021
1999-01-01	1.85556
1999-04-01	2.35920
1999-07-01	2.44091
1999-10-01	2.65105
2000-01-01	2.71823
2000-04-01	3.11856
2000-07-01	2.59666
2000-10-01	1.83594
2001-01-01	1.83999
2001-04-01	1.96001
2001-07-01	1.45066
2001-10-01	1.73987
2002-01-01	1.50692
2002-04-01	1.00098
2002-07-01	0.63268
2002-10-01	0.84023
2003-01-01	2.72522
2003-04-01	3.12403
2003-07-01	3.64499
2003-10-01	2.17338
2004-01-01	1.48893
2004-04-01	0.83223
2004-07-01	0.57060
2004-10-01	0.65832
2005-01-01	0.66426
2005-04-01	0.70078
2005-07-01	0.64679
2005-10-01	0.71269
2006-01-01	0.75230
2006-04-01	1.10109
2006-07-01	0.89068
2006-10-01	0.86533
2007-01-01	0.64912
2007-04-01	1.34316
2007-07-01	0.63643
2007-10-01	1.46443
2008-01-01	1.38830
2008-04-01	1.84313
2008-07-01	2.07588
2008-10-01	1.26875
2009-01-01	1.22956
2009-04-01	0.87591
2009-07-01	1.33104
2009-10-01	1.10712
2010-01-01	1.12650
2010-04-01	1.11757
2010-07-01	1.53221
2010-10-01	1.78565
2011-01-01	1.94748
2011-04-01	1.76642
2011-07-01	1.15105
2011-10-01	0.98632
2012-01-01	1.29014
2012-04-01	1.37543
2012-07-01	1.62547
2012-10-01	2.47045
2013-01-01	2.67244
2013-04-01	2.13441
2013-07-01	1.33267
2013-10-01	0.94794
2014-01-01	0.52287
2014-04-01	0.24166
2014-07-01	0.34334
2014-10-01	0.13940
2015-01-01	0.06998
2015-04-01	0.10629