Quarter	Billions of US Dollars
1987-01-01	1.49934
1987-04-01	1.87136
1987-07-01	2.17636
1987-10-01	2.92374
1988-01-01	2.95310
1988-04-01	2.87796
1988-07-01	2.74046
1988-10-01	2.90337
1989-01-01	2.78940
1989-04-01	2.68687
1989-07-01	2.77774
1989-10-01	2.70453
1990-01-01	2.73291
1990-04-01	2.81331
1990-07-01	2.94466
1990-10-01	2.77458
1991-01-01	2.57911
1991-04-01	2.40851
1991-07-01	2.54342
1991-10-01	2.39255
1992-01-01	2.16915
1992-04-01	1.95726
1992-07-01	1.73802
1992-10-01	1.47639
1993-01-01	1.32220
1993-04-01	1.30516
1993-07-01	1.56373
1993-10-01	1.35705
1994-01-01	1.49516
1994-04-01	1.44311
1994-07-01	1.38428
1994-10-01	1.62921
1995-01-01	1.41185
1995-04-01	1.55442
1995-07-01	1.40680
1995-10-01	1.93525
1996-01-01	2.04623
1996-04-01	2.51034
1996-07-01	2.20092
1996-10-01	2.94191
1997-01-01	3.15383
1997-04-01	3.37875
1997-07-01	3.16816
1997-10-01	3.56207
1998-01-01	3.55476
1998-04-01	3.28808
1998-07-01	3.33080
1998-10-01	3.34547
1999-01-01	3.23097
1999-04-01	2.81326
1999-07-01	2.95159
1999-10-01	3.15291
2000-01-01	3.01256
2000-04-01	3.72342
2000-07-01	2.96780
2000-10-01	3.81908
2001-01-01	4.34286
2001-04-01	4.56424
2001-07-01	4.31979
2001-10-01	4.40469
2002-01-01	4.06963
2002-04-01	3.58601
2002-07-01	4.05569
2002-10-01	3.48266
2003-01-01	4.44275
2003-04-01	3.87602
2003-07-01	3.73650
2003-10-01	3.44372
2004-01-01	4.10779
2004-04-01	4.27682
2004-07-01	4.63819
2004-10-01	5.57772
2005-01-01	4.66365
2005-04-01	3.88720
2005-07-01	3.92043
2005-10-01	2.93220
2006-01-01	2.66519
2006-04-01	2.26707
2006-07-01	2.23449
2006-10-01	2.52539
2007-01-01	2.46716
2007-04-01	3.82004
2007-07-01	3.72811
2007-10-01	4.47382
2008-01-01	4.52500
2008-04-01	4.65421
2008-07-01	4.43893
2008-10-01	3.83865
2009-01-01	3.75907
2009-04-01	3.85632
2009-07-01	3.94933
2009-10-01	5.72385
2010-01-01	5.61775
2010-04-01	5.42863
2010-07-01	5.66878
2010-10-01	5.82393
2011-01-01	5.74270
2011-04-01	5.74960
2011-07-01	5.54697
2011-10-01	5.42371
2012-01-01	5.46645
2012-04-01	5.07802
2012-07-01	5.15456
2012-10-01	5.17415
2013-01-01	5.09823
2013-04-01	5.11643
2013-07-01	5.25732
2013-10-01	5.61017
2014-01-01	4.98303
2014-04-01	5.56571
2014-07-01	5.32905
2014-10-01	5.29866
2015-01-01	5.22471
2015-04-01	5.24865