Quarter	Billions of US Dollars
1966-01-01	0.015
1968-01-01	0.110
1968-04-01	0.060
1968-07-01	0.020
1969-10-01	0.008
1972-07-01	0.027
1975-10-01	0.015
1977-01-01	0.025
1977-10-01	0.090
1978-07-01	0.278
1978-10-01	0.026
1979-01-01	0.081
1980-10-01	-0.015
1983-01-01	0.029
1983-04-01	0.079
1983-07-01	0.100
1983-10-01	0.200
1984-01-01	-0.025
1984-04-01	0.050
1984-07-01	0.025
1984-10-01	0.148
1985-01-01	0.153
1985-04-01	0.313
1985-07-01	0.467
1985-10-01	0.260
1986-01-01	0.518
1986-04-01	0.704
1986-07-01	0.587
1986-10-01	0.092
1987-01-01	0.259
1987-04-01	0.506
1987-07-01	0.953
1987-10-01	1.184
1988-01-01	0.233
1988-04-01	1.051
1988-07-01	0.760
1988-10-01	0.610
1989-01-01	1.463
1989-04-01	0.783
1989-07-01	1.025
1989-10-01	0.858
1990-01-01	0.701
1990-04-01	0.233
1990-07-01	1.790
1990-10-01	0.599
1991-01-01	1.642
1991-04-01	0.962
1991-07-01	0.385
1991-10-01	0.641
1992-01-01	0.951
1992-04-01	0.937
1992-07-01	1.758
1992-10-01	0.443
1993-01-01	0.168
1993-04-01	-0.340
1993-07-01	3.018
1993-10-01	4.232
1994-01-01	2.015
1994-04-01	3.591
1994-07-01	1.811
1994-10-01	3.998
1995-01-01	3.082
1995-04-01	6.401
1995-07-01	5.996
1995-10-01	3.224
1996-01-01	6.978
1996-04-01	10.805
1996-07-01	4.061
1996-10-01	17.073
1997-01-01	9.818
1997-04-01	8.835
1997-07-01	20.887
1997-10-01	19.186
1998-01-01	12.051
1998-04-01	18.440
1998-07-01	11.052
1998-10-01	2.743
1999-01-01	12.929
1999-04-01	16.387
1999-07-01	8.765
1999-10-01	10.263
2000-01-01	17.439
2000-04-01	8.107
2000-07-01	20.758
2000-10-01	15.833
2001-01-01	22.545
2001-04-01	23.056
2001-07-01	14.887
2001-10-01	14.093
2002-01-01	7.883
2002-04-01	14.762
2002-07-01	1.138
2002-10-01	-0.569
2003-01-01	-0.247
2003-04-01	3.519
2003-07-01	-0.496
2003-10-01	-5.863
2004-01-01	3.385
2004-04-01	-0.727
2004-07-01	5.677
2004-10-01	1.408
2005-01-01	-3.780
2005-04-01	2.638
2005-07-01	6.556
2005-10-01	43.500
2006-01-01	46.891
2006-04-01	47.732
2006-07-01	76.220
2006-10-01	122.971
2007-01-01	89.945
2007-04-01	99.149
2007-07-01	61.032
2007-10-01	23.931
2008-01-01	12.657
2008-04-01	-0.288
2008-07-01	-2.619
2008-10-01	-4.537
2009-01-01	-4.824
2009-04-01	6.553
2009-07-01	1.458
2009-10-01	-3.671
2010-01-01	-0.295
2010-04-01	-5.686
2010-07-01	6.954
2010-10-01	8.523
2011-01-01	-5.606
2011-04-01	-9.324
2011-07-01	-4.990
2011-10-01	6.776
2012-01-01	20.361
2012-04-01	2.328
2012-07-01	11.693
2012-10-01	31.287
2013-01-01	11.680
2013-04-01	20.280
2013-07-01	5.675
2013-10-01	18.556
2014-01-01	14.427
2014-04-01	34.707
2014-07-01	19.350
2014-10-01	17.803
2015-01-01	13.937
2015-04-01	14.238