Quarter	Billions of US Dollars
1971-01-01	0.0150
1971-10-01	0.0684
1972-01-01	0.0586
1972-04-01	0.0498
1972-07-01	0.1021
1972-10-01	0.0812
1973-01-01	0.0560
1973-04-01	0.0159
1973-07-01	0.0665
1974-01-01	0.0313
1974-04-01	0.0017
1974-10-01	0.0716
1975-01-01	0.1405
1975-04-01	0.0220
1975-07-01	0.1696
1975-10-01	0.0722
1976-01-01	0.0672
1976-04-01	0.0454
1976-07-01	0.0654
1976-10-01	0.1808
1977-01-01	0.0576
1977-04-01	0.0995
1977-07-01	0.0732
1977-10-01	0.1859
1978-01-01	0.3265
1978-04-01	0.2963
1978-07-01	0.1531
1978-10-01	0.2421
1979-01-01	0.3209
1979-04-01	0.1383
1979-07-01	0.0444
1979-10-01	0.1820
1980-01-01	0.0795
1980-04-01	0.1180
1980-07-01	0.0485
1980-10-01	0.0313
1981-01-01	0.0336
1981-04-01	0.2593
1981-07-01	0.0450
1981-10-01	0.2641
1982-01-01	0.2375
1982-04-01	0.1497
1982-07-01	0.2021
1982-10-01	0.1970
1983-01-01	0.1996
1983-04-01	0.3600
1983-07-01	0.1551
1983-10-01	0.1329
1984-01-01	0.5654
1984-04-01	0.3043
1984-07-01	0.1785
1984-10-01	0.3028
1985-01-01	0.5014
1985-04-01	0.1895
1985-07-01	0.3194
1985-10-01	0.3520
1986-01-01	0.7460
1986-04-01	0.5535
1986-07-01	0.9992
1986-10-01	1.0240
1987-01-01	1.0317
1987-04-01	0.7169
1987-07-01	0.3356
1987-10-01	0.8171
1988-01-01	1.5042
1988-04-01	1.0924
1988-07-01	0.8712
1988-10-01	1.1046
1989-01-01	1.9660
1989-04-01	1.1424
1989-07-01	0.4136
1989-10-01	1.5581
1990-01-01	1.2669
1990-04-01	2.3187
1990-07-01	1.3509
1990-10-01	1.8799
1991-01-01	2.1967
1991-04-01	2.6064
1991-07-01	2.3536
1991-10-01	1.4170
1992-01-01	3.5620
1992-04-01	4.6143
1992-07-01	2.3838
1992-10-01	4.4131
1993-01-01	4.5879
1993-04-01	2.1503
1993-07-01	1.1964
1993-10-01	0.9812
1994-01-01	2.6174
1994-04-01	3.1969
1994-07-01	4.4471
1994-10-01	1.1254
1995-01-01	1.4644
1995-04-01	0.3497
1995-07-01	0.2677
1995-10-01	0.7803
1996-01-01	3.1636
1996-04-01	7.7379
1996-07-01	6.8738
1996-10-01	1.9740
1997-01-01	2.6977
1997-04-01	1.5684
1997-07-01	1.2213
1997-10-01	1.4587
1998-01-01	0.1807
1998-04-01	2.5432
1998-07-01	0.5133
1998-10-01	1.6394
1999-01-01	0.5947
1999-04-01	1.1499
1999-07-01	1.1965
1999-10-01	0.5187
2000-01-01	2.2098
2000-04-01	1.7430
2000-07-01	1.1661
2000-10-01	0.3849
2001-01-01	1.2756
2001-04-01	5.6785
2001-07-01	0.4507
2001-10-01	0.5968
2002-01-01	2.2105
2002-04-01	0.8780
2002-07-01	0.9768
2002-10-01	0.9645
2003-01-01	7.9715
2003-04-01	6.9798
2003-07-01	3.1948
2003-10-01	2.0533
2004-01-01	4.8311
2004-04-01	2.2216
2004-07-01	1.3738
2004-10-01	2.3043
2005-01-01	2.6125
2005-04-01	3.1162
2005-07-01	1.7292
2005-10-01	2.2141
2006-01-01	4.7376
2006-04-01	4.3902
2006-07-01	2.0693
2006-10-01	3.4596
2007-01-01	1.7929
2007-04-01	4.7109
2007-07-01	0.6338
2007-10-01	1.1744
2008-01-01	1.9685
2008-04-01	2.8262
2008-07-01	3.5774
2008-10-01	0.8851
2009-01-01	7.8004
2009-04-01	9.7242
2009-07-01	2.9905
2009-10-01	4.4642
2010-01-01	7.0878
2010-04-01	3.6435
2010-07-01	4.1598
2010-10-01	10.3310
2011-01-01	18.6955
2011-04-01	13.1944
2011-07-01	5.6705
2011-10-01	5.3758
2012-01-01	14.7618
2012-04-01	12.8874
2012-07-01	6.2494
2012-10-01	5.7462
2013-01-01	9.6215
2013-04-01	10.2408
2013-07-01	10.9720
2013-10-01	8.6077
2014-01-01	11.9258
2014-04-01	15.2795
2014-07-01	7.5623
2014-10-01	7.5423
2015-01-01	11.3980
2015-04-01	10.6559