Quarter	Billions of US Dollars
1968-07-01	0.0400
1972-04-01	0.0252
1972-10-01	0.0500
1973-01-01	0.0300
1973-04-01	0.0366
1973-10-01	0.0204
1974-01-01	0.0662
1974-04-01	0.0172
1974-10-01	0.0189
1975-01-01	0.0448
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	0.1161
1981-10-01	0.1504
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	1.5401
1985-07-01	0.6584
1985-10-01	2.0456
1986-01-01	1.2837
1986-04-01	0.5345
1986-07-01	0.1911
1986-10-01	0.2854
1987-01-01	0.6312
1987-04-01	0.2311
1987-07-01	0.5509
1987-10-01	0.4727
1988-01-01	-0.0271
1988-04-01	-0.0775
1988-07-01	0.8535
1988-10-01	0.3734
1989-01-01	-0.0762
1989-04-01	-0.0232
1989-07-01	-0.1104
1989-10-01	0.7568
1990-01-01	0.2362
1990-04-01	0.3107
1990-07-01	0.5363
1990-10-01	0.1803
1991-01-01	0.7245
1991-04-01	1.6810
1991-07-01	0.4973
1991-10-01	0.5011
1992-01-01	0.2670
1992-04-01	0.0636
1992-07-01	1.6014
1992-10-01	3.3772
1993-01-01	0.3880
1993-04-01	1.3121
1993-07-01	1.5475
1993-10-01	5.5481
1994-01-01	4.5588
1994-04-01	4.1085
1994-07-01	4.7309
1994-10-01	1.9127
1995-01-01	1.0093
1995-04-01	1.3762
1995-07-01	5.4863
1995-10-01	2.1876
1996-01-01	5.6474
1996-04-01	6.9496
1996-07-01	10.0519
1996-10-01	13.3784
1997-01-01	8.5302
1997-04-01	12.6430
1997-07-01	11.8013
1997-10-01	5.3972
1998-01-01	0.0783
1998-04-01	5.8243
1998-07-01	-2.9335
1998-10-01	-0.8454
1999-01-01	-0.0627
1999-04-01	0.4688
1999-07-01	-3.1197
1999-10-01	-0.9511
2000-01-01	2.8327
2000-04-01	-2.5032
2000-07-01	-1.8009
2000-10-01	0.4639
2001-01-01	-2.5416
2001-04-01	1.1185
2001-07-01	-2.5560
2001-10-01	1.4791
2002-01-01	3.3473
2002-04-01	6.0077
2002-07-01	2.9537
2002-10-01	3.8211
2003-01-01	1.2185
2003-04-01	5.4240
2003-07-01	6.4887
2003-10-01	6.7721
2004-01-01	8.5432
2004-04-01	7.0289
2004-07-01	6.7766
2004-10-01	10.2021
2005-01-01	8.8379
2005-04-01	6.4606
2005-07-01	6.2175
2005-10-01	10.1395
2006-01-01	11.6360
2006-04-01	8.1765
2006-07-01	10.3950
2006-10-01	12.3602
2007-01-01	15.2160
2007-04-01	20.6174
2007-07-01	0.0790
2007-10-01	6.1520
2008-01-01	3.2452
2008-04-01	4.8201
2008-07-01	5.1111
2008-10-01	-6.6912
2009-01-01	2.0165
2009-04-01	6.8631
2009-07-01	13.9115
2009-10-01	5.1670
2010-01-01	8.1912
2010-04-01	6.1090
2010-07-01	15.7515
2010-10-01	27.5700
2011-01-01	20.6801
2011-04-01	31.5667
2011-07-01	9.8930
2011-10-01	6.7421
2012-01-01	23.3126
2012-04-01	29.7849
2012-07-01	22.1130
2012-10-01	19.6614
2013-01-01	26.2275
2013-04-01	40.7146
2013-07-01	22.6592
2013-10-01	42.4493
2014-01-01	30.9752
2014-04-01	52.7585
2014-07-01	31.9479
2014-10-01	71.0563
2015-01-01	29.9923
2015-04-01	57.4496