Quarter	Billions of US Dollars
1972-04-01	0.0366
1972-10-01	0.0500
1973-04-01	0.0366
1973-10-01	0.0204
1974-01-01	0.0162
1974-04-01	0.0172
1974-10-01	0.0189
1975-01-01	0.0250
1975-10-01	0.0175
1976-04-01	0.0134
1976-07-01	0.3981
1976-10-01	0.0515
1977-01-01	0.0876
1977-04-01	0.0366
1977-07-01	0.0869
1977-10-01	0.0465
1978-01-01	0.1801
1978-04-01	0.1464
1978-07-01	0.1298
1978-10-01	0.1284
1979-01-01	0.2734
1979-04-01	0.1083
1979-07-01	0.2158
1980-04-01	0.0509
1980-07-01	0.1416
1980-10-01	0.0473
1981-04-01	0.0628
1981-07-01	0.1461
1981-10-01	0.1754
1982-01-01	0.4450
1982-04-01	0.2905
1982-07-01	0.0373
1982-10-01	0.4870
1983-01-01	0.0527
1983-04-01	0.2382
1983-07-01	1.3333
1983-10-01	0.1790
1984-01-01	0.4212
1984-04-01	0.0418
1984-07-01	0.3778
1984-10-01	1.0856
1985-01-01	0.7350
1985-04-01	1.5115
1985-07-01	0.6584
1985-10-01	2.0124
1986-01-01	1.3337
1986-04-01	0.5345
1986-07-01	0.1911
1986-10-01	0.2604
1987-01-01	0.3196
1987-04-01	0.2297
1987-07-01	0.4926
1987-10-01	0.4727
1988-01-01	-0.0710
1988-04-01	-0.1275
1988-07-01	0.8275
1988-10-01	0.3748
1989-01-01	-0.0762
1989-04-01	-0.0232
1989-07-01	-0.1104
1989-10-01	0.7168
1990-01-01	0.2280
1990-04-01	0.3107
1990-07-01	0.4968
1990-10-01	0.1803
1991-01-01	0.7245
1991-04-01	1.7780
1991-07-01	0.1473
1991-10-01	0.4839
1992-01-01	0.4773
1992-04-01	0.1144
1992-07-01	1.3946
1992-10-01	2.9718
1993-01-01	0.1080
1993-04-01	1.2047
1993-07-01	1.5889
1993-10-01	4.8864
1994-01-01	3.4384
1994-04-01	3.9697
1994-07-01	4.4309
1994-10-01	1.5827
1995-01-01	0.9601
1995-04-01	1.4716
1995-07-01	5.1608
1995-10-01	2.4361
1996-01-01	4.2981
1996-04-01	5.5483
1996-07-01	8.7340
1996-10-01	10.6043
1997-01-01	6.9909
1997-04-01	10.0371
1997-07-01	8.5649
1997-10-01	3.4858
1998-01-01	-0.2956
1998-04-01	4.3654
1998-07-01	-2.9027
1998-10-01	-1.2557
1999-01-01	0.1260
1999-04-01	0.5758
1999-07-01	-3.2779
1999-10-01	-0.2661
2000-01-01	3.2539
2000-04-01	-2.0163
2000-07-01	-1.3845
2000-10-01	-0.0214
2001-01-01	-2.1816
2001-04-01	1.8170
2001-07-01	-3.1948
2001-10-01	2.6445
2002-01-01	2.6169
2002-04-01	5.4448
2002-07-01	1.9947
2002-10-01	2.5759
2003-01-01	2.1465
2003-04-01	4.8314
2003-07-01	5.6367
2003-10-01	2.8550
2004-01-01	8.1518
2004-04-01	6.6841
2004-07-01	5.1482
2004-10-01	6.3110
2005-01-01	5.7260
2005-04-01	5.1702
2005-07-01	5.5948
2005-10-01	5.9849
2006-01-01	9.3752
2006-04-01	3.6799
2006-07-01	6.1069
2006-10-01	5.0566
2007-01-01	7.0015
2007-04-01	11.8232
2007-07-01	0.3884
2007-10-01	5.4879
2008-01-01	3.4802
2008-04-01	1.3361
2008-07-01	-0.2432
2008-10-01	-6.0733
2009-01-01	4.8351
2009-04-01	4.8807
2009-07-01	12.1132
2009-10-01	4.7991
2010-01-01	5.0910
2010-04-01	2.5839
2010-07-01	4.8822
2010-10-01	12.0971
2011-01-01	9.3900
2011-04-01	10.6177
2011-07-01	6.0544
2011-10-01	3.8683
2012-01-01	13.3111
2012-04-01	15.9116
2012-07-01	14.8671
2012-10-01	8.1527
2013-01-01	10.2178
2013-04-01	13.0240
2013-07-01	18.9335
2013-10-01	14.9200
2014-01-01	12.9224
2014-04-01	13.8079
2014-07-01	8.7152
2014-10-01	39.1157
2015-01-01	12.6217
2015-04-01	18.7747