Quarter	Billions of US Dollars
1987-01-01	0.46300
1987-04-01	0.52500
1987-07-01	0.34700
1987-10-01	0.30500
1988-01-01	0.36900
1988-04-01	0.43300
1988-07-01	0.46800
1988-10-01	0.42400
1989-01-01	0.41000
1989-04-01	0.40500
1989-07-01	0.38100
1989-10-01	0.31700
1990-01-01	0.42900
1990-04-01	0.42100
1990-07-01	0.09300
1990-10-01	0.33000
1991-01-01	0.34400
1991-04-01	0.30600
1991-07-01	0.28900
1991-10-01	0.11700
1992-01-01	0.22500
1992-04-01	0.27400
1992-07-01	0.22400
1992-10-01	0.09300
1993-01-01	0.25400
1993-04-01	0.15200
1993-07-01	0.08900
1993-10-01	0.04700
1994-01-01	0.04700
1994-04-01	0.03000
1994-07-01	0.01500
1994-10-01	0.02000
1995-01-01	0.05800
1995-04-01	0.56961
1995-07-01	1.30595
1995-10-01	2.03550
1996-01-01	1.95956
1996-04-01	2.07943
1996-07-01	3.84801
1996-10-01	5.07888
1997-01-01	4.41803
1997-04-01	3.84242
1997-07-01	3.07253
1997-10-01	1.43587
1998-01-01	1.32235
1998-04-01	1.49415
1998-07-01	1.06702
1998-10-01	1.07519
1999-01-01	1.17033
1999-04-01	0.82000
1999-07-01	0.70432
1999-10-01	0.90523
2000-01-01	1.11100
2000-04-01	1.00534
2000-07-01	1.65267
2000-10-01	1.33209
2001-01-01	0.76640
2001-04-01	0.84107
2001-07-01	0.35426
2001-10-01	0.38263
2002-01-01	0.29800
2002-04-01	0.70790
2002-07-01	0.77078
2002-10-01	0.84657
2003-01-01	0.96666
2003-04-01	0.62091
2003-07-01	0.74121
2003-10-01	0.91886
2004-01-01	1.33938
2004-04-01	1.00748
2004-07-01	0.69515
2004-10-01	0.86279
2005-01-01	1.01378
2005-04-01	1.27137
2005-07-01	1.42868
2005-10-01	1.64318
2006-01-01	2.33531
2006-04-01	2.64376
2006-07-01	3.60854
2006-10-01	3.77621
2007-01-01	4.54980
2007-04-01	4.60746
2007-07-01	5.82695
2007-10-01	6.14663
2008-01-01	7.29335
2008-04-01	8.79518
2008-07-01	8.48353
2008-10-01	3.15144
2009-01-01	3.77341
2009-04-01	6.06042
2009-07-01	6.60873
2009-10-01	6.71890
2010-01-01	6.30122
2010-04-01	5.98359
2010-07-01	5.82627
2010-10-01	4.11433
2011-01-01	4.38094
2011-04-01	4.54627
2011-07-01	5.22094
2011-10-01	6.38828
2012-01-01	6.53561
2012-04-01	6.97273
2012-07-01	7.26765
2012-10-01	5.95200
2013-01-01	5.72939
2013-04-01	5.88136
2013-07-01	6.71220
2013-10-01	7.25426
2014-01-01	7.49447
2014-04-01	6.62761
2014-07-01	5.09591
2014-10-01	5.93493
2015-01-01	6.57840
2015-04-01	7.89197