Quarter	Billions of US Dollars
1971-01-01	0.0100
1972-04-01	0.0259
1973-01-01	0.0234
1973-04-01	0.0906
1974-01-01	0.0049
1975-07-01	0.0377
1975-10-01	0.0192
1976-04-01	-0.0078
1976-07-01	0.0747
1976-10-01	0.1150
1977-01-01	0.0200
1977-04-01	-0.0085
1977-07-01	0.0576
1977-10-01	0.0287
1978-07-01	0.0172
1979-01-01	0.0292
1979-07-01	0.9317
1979-10-01	0.5069
1980-04-01	0.0090
1980-10-01	0.0797
1981-01-01	0.0778
1981-04-01	0.0039
1981-07-01	-0.0269
1981-10-01	0.0385
1982-01-01	0.0533
1982-04-01	0.0496
1982-07-01	0.0380
1983-01-01	0.1907
1983-04-01	0.1500
1983-07-01	0.0602
1983-10-01	0.3386
1984-01-01	0.1235
1984-04-01	0.0877
1984-07-01	0.4433
1984-10-01	0.4630
1985-01-01	0.4277
1985-04-01	0.2945
1985-07-01	0.5988
1985-10-01	0.1678
1986-01-01	1.1178
1986-04-01	0.7124
1986-07-01	0.7479
1986-10-01	0.5262
1987-01-01	0.1651
1987-04-01	0.0624
1987-07-01	0.2748
1987-10-01	-0.1579
1988-01-01	0.0961
1988-04-01	0.0880
1988-07-01	0.0878
1988-10-01	0.4943
1989-01-01	-0.1182
1989-04-01	0.0453
1989-07-01	0.1628
1989-10-01	0.0425
1990-01-01	0.2964
1990-04-01	1.1825
1990-07-01	-0.1871
1990-10-01	0.2012
1991-01-01	1.0206
1991-04-01	0.0990
1991-07-01	-0.0892
1991-10-01	0.3998
1992-01-01	-0.0523
1992-04-01	-0.0621
1992-07-01	-0.3567
1992-10-01	0.5302
1993-01-01	-0.0072
1993-04-01	0.4306
1993-07-01	-0.3141
1993-10-01	0.5054
1994-01-01	0.3477
1994-04-01	0.3170
1994-07-01	0.4454
1994-10-01	1.3576
1995-01-01	0.7940
1995-04-01	0.7010
1995-07-01	0.6697
1995-10-01	0.1567
1996-01-01	-1.8062
1996-04-01	-1.1137
1996-07-01	0.2688
1996-10-01	-0.4598
1997-01-01	-0.1396
1997-04-01	0.3093
1997-07-01	1.4904
1997-10-01	0.6414
1998-01-01	-0.6456
1998-04-01	-1.2381
1998-07-01	-0.3200
1998-10-01	-0.5357
1999-01-01	-0.1566
1999-04-01	-0.4214
1999-07-01	-0.4841
1999-10-01	-1.5245
2000-01-01	0.1921
2000-04-01	-0.3691
2000-07-01	0.1607
2000-10-01	0.5559
2001-01-01	4.3149
2001-04-01	4.3534
2001-07-01	1.1619
2001-10-01	0.1229
2002-01-01	3.4903
2002-04-01	-0.5323
2002-07-01	0.0574
2002-10-01	0.7373
2003-01-01	0.5751
2003-04-01	1.0039
2003-07-01	0.1665
2003-10-01	1.0339
2004-01-01	0.4246
2004-04-01	1.6449
2004-07-01	1.6241
2004-10-01	0.0610
2005-01-01	-0.4742
2005-04-01	1.5534
2005-07-01	-1.3301
2005-10-01	0.6982
2006-01-01	5.1411
2006-04-01	1.0984
2006-07-01	-4.4063
2006-10-01	5.0805
2007-01-01	4.0583
2007-04-01	15.2843
2007-07-01	-0.3483
2007-10-01	4.2951
2008-01-01	-1.1620
2008-04-01	16.9876
2008-07-01	-2.6232
2008-10-01	21.4161
2009-01-01	9.0865
2009-04-01	18.9578
2009-07-01	1.3558
2009-10-01	6.5652
2010-01-01	7.3609
2010-04-01	3.1174
2010-07-01	8.3617
2010-10-01	-2.8888
2011-01-01	1.2592
2011-04-01	-0.5395
2011-07-01	-7.6898
2011-10-01	-0.8183
2012-01-01	-7.8094
2012-04-01	3.0472
2012-07-01	2.3445
2012-10-01	0.2581
2013-01-01	0.7785
2013-04-01	2.9406
2013-07-01	8.7042
2013-10-01	3.2697
2014-01-01	-3.8633
2014-04-01	-1.5071
2014-07-01	0.0056
2014-10-01	1.7611
2015-01-01	2.0630
2015-04-01	2.6671