Quarter	Billions of US Dollars
1987-01-01	0.27800
1987-04-01	0.65100
1987-07-01	0.29500
1987-10-01	0.43400
1988-01-01	0.32700
1988-04-01	0.32300
1988-07-01	0.29300
1988-10-01	0.60100
1989-01-01	0.57700
1989-04-01	0.57100
1989-07-01	0.64600
1989-10-01	0.73900
1990-01-01	1.52900
1990-04-01	1.74000
1990-07-01	2.08200
1990-10-01	1.74400
1991-01-01	2.08000
1991-04-01	2.02200
1991-07-01	1.73500
1991-10-01	1.63700
1992-01-01	2.34400
1992-04-01	2.32800
1992-07-01	1.96700
1992-10-01	1.97700
1993-01-01	1.90300
1993-04-01	1.88000
1993-07-01	2.01501
1993-10-01	1.82477
1994-01-01	1.93935
1994-04-01	1.16789
1994-07-01	0.09090
1994-10-01	0.05626
1995-01-01	0.02803
1995-04-01	0.01387
1995-07-01	0.00632
1995-10-01	0.01100
1997-04-01	0.02500
1997-10-01	0.20856
1998-01-01	0.12097
1998-04-01	0.15831
1998-07-01	0.57441
1998-10-01	0.32402
1999-01-01	0.32309
1999-04-01	0.40351
1999-07-01	0.49509
1999-10-01	0.59589
2000-01-01	0.57723
2000-04-01	0.59703
2000-07-01	0.42812
2000-10-01	0.39426
2001-01-01	0.50803
2001-04-01	0.34094
2001-07-01	0.40489
2001-10-01	0.48980
2002-01-01	0.53434
2002-04-01	0.61658
2002-07-01	0.73518
2002-10-01	0.99850
2003-01-01	1.05433
2003-04-01	1.13275
2003-07-01	1.01523
2003-10-01	1.01038
2004-01-01	1.04152
2004-04-01	1.31015
2004-07-01	1.37090
2004-10-01	1.78957
2005-01-01	1.81272
2005-04-01	1.57865
2005-07-01	1.44397
2005-10-01	1.40152
2006-01-01	1.33009
2006-04-01	1.47916
2006-07-01	3.16229
2006-10-01	1.46596
2007-01-01	1.25062
2007-04-01	1.23098
2007-07-01	1.58535
2007-10-01	1.90366
2008-01-01	2.29852
2008-04-01	2.10933
2008-07-01	2.51248
2008-10-01	2.10445
2009-01-01	1.64922
2009-04-01	1.92053
2009-07-01	2.45470
2009-10-01	2.51096
2010-01-01	2.79890
2010-04-01	2.41944
2010-07-01	2.20567
2010-10-01	1.95390
2011-01-01	1.26851
2011-04-01	1.38526
2011-07-01	1.14706
2011-10-01	1.01128
2012-01-01	0.82847
2012-04-01	0.87332
2012-07-01	1.01349
2012-10-01	1.13505
2013-01-01	1.16686
2013-04-01	1.54460
2013-07-01	1.82365
2013-10-01	1.81401
2014-01-01	3.08000
2014-04-01	4.61987
2014-07-01	4.90908
2014-10-01	4.26069
2015-01-01	3.50438
2015-04-01	4.18103