Quarter	Billions of US Dollars
1987-01-01	0.38714
1987-04-01	0.48701
1987-07-01	0.48914
1987-10-01	0.57395
1988-01-01	0.55398
1988-04-01	0.52835
1988-07-01	0.51159
1988-10-01	0.52875
1989-01-01	0.44174
1989-04-01	0.42295
1989-07-01	0.40677
1989-10-01	0.41579
1990-01-01	0.42121
1990-04-01	0.43334
1990-07-01	0.43095
1990-10-01	0.21579
1991-01-01	0.20274
1991-04-01	0.19615
1991-07-01	0.20348
1991-10-01	0.21066
1992-01-01	0.26313
1992-04-01	0.27155
1992-07-01	0.28210
1992-10-01	0.26203
1993-01-01	0.25999
1993-04-01	0.25786
1993-07-01	0.37525
1993-10-01	0.42474
1994-01-01	0.50544
1994-04-01	0.23756
1994-07-01	0.29400
1994-10-01	0.31644
1995-01-01	0.29743
1995-04-01	0.27474
1995-07-01	0.29481
1995-10-01	0.66709
1996-01-01	1.01397
1996-04-01	0.97899
1996-07-01	0.78349
1996-10-01	1.52496
1997-01-01	1.70677
1997-04-01	1.92612
1997-07-01	1.73001
1997-10-01	2.26867
1998-01-01	2.27558
1998-04-01	2.02458
1998-07-01	2.07584
1998-10-01	2.25201
1999-01-01	2.18127
1999-04-01	1.92304
1999-07-01	2.40767
1999-10-01	2.62106
2000-01-01	2.49478
2000-04-01	3.10699
2000-07-01	2.41144
2000-10-01	3.20684
2001-01-01	3.73012
2001-04-01	3.95876
2001-07-01	3.66234
2001-10-01	3.82761
2002-01-01	3.47705
2002-04-01	2.97849
2002-07-01	3.59670
2002-10-01	3.04892
2003-01-01	3.70945
2003-04-01	3.26381
2003-07-01	3.14549
2003-10-01	2.84444
2004-01-01	3.50189
2004-04-01	3.66405
2004-07-01	4.03705
2004-10-01	4.97328
2005-01-01	4.44085
2005-04-01	3.38738
2005-07-01	3.39391
2005-10-01	2.39772
2006-01-01	2.11994
2006-04-01	2.17096
2006-07-01	2.11796
2006-10-01	2.41659
2007-01-01	2.36694
2007-04-01	2.51821
2007-07-01	2.37865
2007-10-01	2.33402
2008-01-01	2.31135
2008-04-01	2.46038
2008-07-01	2.30505
2008-10-01	1.71955
2009-01-01	1.69232
2009-04-01	1.72245
2009-07-01	1.78959
2009-10-01	1.81035
2010-01-01	2.00578
2010-04-01	2.06492
2010-07-01	2.21902
2010-10-01	2.45710
2011-01-01	2.47527
2011-04-01	2.67155
2011-07-01	2.55019
2011-10-01	2.52107
2012-01-01	2.53095
2012-04-01	2.20645
2012-07-01	2.26245
2012-10-01	2.25277
2013-01-01	2.08810
2013-04-01	3.49815
2013-07-01	3.58157
2013-10-01	3.28795
2014-01-01	3.24307
2014-04-01	4.06139
2014-07-01	3.79923
2014-10-01	3.83442
2015-01-01	3.78897
2015-04-01	3.78372