Quarter	Billions of US Dollars
1980-07-01	0.025
1980-10-01	0.025
1981-01-01	0.025
1981-04-01	0.025
1981-07-01	0.025
1981-10-01	0.025
1982-01-01	0.066
1982-04-01	0.084
1982-07-01	0.081
1982-10-01	0.089
1983-01-01	0.088
1983-04-01	0.128
1983-07-01	0.150
1983-10-01	0.151
1984-01-01	0.154
1984-04-01	0.149
1984-07-01	0.146
1984-10-01	0.224
1985-01-01	0.342
1985-04-01	0.476
1985-07-01	0.838
1985-10-01	1.099
1986-01-01	1.544
1986-04-01	2.071
1986-07-01	2.532
1986-10-01	2.632
1987-01-01	3.019
1987-04-01	3.198
1987-07-01	3.428
1987-10-01	4.287
1988-01-01	4.465
1988-04-01	4.424
1988-07-01	4.602
1988-10-01	5.025
1989-01-01	4.840
1989-04-01	4.697
1989-07-01	4.822
1989-10-01	4.872
1990-01-01	4.602
1990-04-01	4.688
1990-07-01	5.002
1990-10-01	5.107
1991-01-01	4.883
1991-04-01	4.929
1991-07-01	5.242
1991-10-01	5.523
1992-01-01	5.110
1992-04-01	5.403
1992-07-01	5.857
1992-10-01	5.794
1993-01-01	5.805
1993-04-01	6.543
1993-07-01	8.635
1993-10-01	8.970
1994-01-01	10.815
1994-04-01	11.477
1994-07-01	12.752
1994-10-01	13.330
1995-01-01	13.999
1995-04-01	14.191
1995-07-01	13.755
1995-10-01	13.255
1996-01-01	12.806
1996-04-01	12.392
1996-07-01	13.830
1996-10-01	14.306
1997-01-01	14.650
1997-04-01	17.694
1997-07-01	17.784
1997-10-01	17.617
1998-01-01	17.864
1998-04-01	17.124
1998-07-01	16.404
1998-10-01	17.582
1999-01-01	16.911
1999-04-01	17.116
1999-07-01	17.370
1999-10-01	17.881
2000-01-01	17.442
2000-04-01	17.492
2000-07-01	17.058
2000-10-01	17.742
2001-01-01	17.268
2001-04-01	19.175
2001-07-01	18.133
2001-10-01	18.064
2002-01-01	19.563
2002-04-01	19.587
2002-07-01	18.993
2002-10-01	18.097
2003-01-01	17.212
2003-04-01	17.499
2003-07-01	18.062
2003-10-01	20.903
2004-01-01	19.968
2004-04-01	19.539
2004-07-01	20.562
2004-10-01	24.145
2005-01-01	24.245
2005-04-01	23.922
2005-07-01	25.891
2005-10-01	26.908
2006-01-01	27.077
2006-04-01	27.927
2006-07-01	27.718
2006-10-01	28.940
2007-01-01	31.058
2007-04-01	36.743
2007-07-01	39.586
2007-10-01	40.334
2008-01-01	40.943
2008-04-01	43.368
2008-07-01	45.550
2008-10-01	45.058
2009-01-01	44.026
2009-04-01	44.795
2009-07-01	45.070
2009-10-01	46.440
2010-01-01	49.163
2010-04-01	52.311
2010-07-01	60.421
2010-10-01	70.167
2011-01-01	80.919
2011-04-01	98.778
2011-07-01	104.256
2011-10-01	109.057
2012-01-01	112.401
2012-04-01	130.508
2012-07-01	135.732
2012-10-01	149.024
2013-01-01	162.295
2013-04-01	186.562
2013-07-01	193.725
2013-10-01	221.910
2014-01-01	240.955
2014-04-01	281.426
2014-07-01	303.688
2014-10-01	354.532
2015-01-01	373.678
2015-04-01	413.454