Quarter	Billions of US Dollars
1976-04-01	0.01019
1976-07-01	0.01032
1976-10-01	0.04530
1977-01-01	0.07340
1977-04-01	0.07356
1977-07-01	0.07369
1977-10-01	0.07494
1978-01-01	0.10151
1978-04-01	0.10186
1978-07-01	0.17043
1978-10-01	0.17071
1979-01-01	0.16842
1979-04-01	0.16801
1979-07-01	0.19009
1979-10-01	0.19125
1980-01-01	0.21130
1980-04-01	0.21846
1980-07-01	0.21811
1980-10-01	0.21439
1981-01-01	0.21091
1981-04-01	0.20525
1981-07-01	0.20488
1981-10-01	0.20762
1982-01-01	0.20398
1982-04-01	0.20161
1982-07-01	0.19950
1982-10-01	0.20197
1983-01-01	0.19956
1983-04-01	0.19904
1983-07-01	0.19933
1983-10-01	0.19771
1984-01-01	0.19760
1984-04-01	0.19569
1984-07-01	0.19184
1984-10-01	0.18889
1985-01-01	0.18884
1985-04-01	0.18858
1985-07-01	0.19379
1985-10-01	0.17420
1986-01-01	0.17486
1986-04-01	0.17418
1986-07-01	0.16838
1986-10-01	0.13421
1987-01-01	0.11344
1987-04-01	0.11114
1987-07-01	0.09686
1987-10-01	0.10383
1988-01-01	0.07567
1988-04-01	0.07244
1988-07-01	0.03153
1988-10-01	0.03022
1989-01-01	0.02771
1989-04-01	0.02744
1989-07-01	0.02349
1989-10-01	0.02457
1996-07-01	0.29005
1996-10-01	0.38642
1997-01-01	0.36579
1997-04-01	0.35520
1997-07-01	0.35282
1997-10-01	0.35050
1998-01-01	0.34254
1998-04-01	0.34520
1998-07-01	0.36707
1998-10-01	0.36680
1999-01-01	0.34564
1999-04-01	0.47942
1999-07-01	0.49180
1999-10-01	0.46906
2000-01-01	0.45095
2000-04-01	0.45106
2000-07-01	0.42200
2000-10-01	0.44184
2001-01-01	0.42446
2001-04-01	0.41153
2001-07-01	0.43545
2001-10-01	0.32376
2002-01-01	0.32049
2002-04-01	0.36645
2002-07-01	0.13676
2002-10-01	0.14545
2003-01-01	0.15111
2003-04-01	0.15849
2003-07-01	0.62769
2003-10-01	0.68038
2004-01-01	0.65851
2004-04-01	0.48620
2004-07-01	0.49636
2004-10-01	0.54484
2005-01-01	0.51856
2005-04-01	0.48368
2005-07-01	0.48168
2005-10-01	0.47188
2006-01-01	0.48416
2006-04-01	0.50852
2006-07-01	0.50640
2006-10-01	0.52680
2007-01-01	0.53272
2007-04-01	1.21545
2007-07-01	1.27611
2007-10-01	1.32489
2008-01-01	1.42308
2008-04-01	1.41876
2008-07-01	0.71515
2008-10-01	0.69585
2009-01-01	0.66540
2009-04-01	0.70670
2009-07-01	0.73215
2009-10-01	0.72030
2010-01-01	0.67395
2010-04-01	0.61355
2010-07-01	0.68240
2010-10-01	2.00430
2011-01-01	2.13105
2011-04-01	2.16795
2011-07-01	2.02545
2011-10-01	1.94085
2012-01-01	2.00340
2012-04-01	1.88850
2012-07-01	1.93950
2012-10-01	3.47910
2013-01-01	3.42075
2013-04-01	4.21200
2013-07-01	4.27575
2013-10-01	4.91865
2014-01-01	4.91820
2014-04-01	7.81450
2014-07-01	7.61834
2014-10-01	7.50567
2015-01-01	7.15371
2015-04-01	8.26121