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	0.1263
1979-07-01	0.2412
1980-04-01	0.0760
1980-07-01	0.1416
1980-10-01	0.0473
1981-04-01	0.0664
1981-07-01	0.1461
1981-10-01	0.2290
1982-01-01	0.4700
1982-04-01	0.2905
1982-07-01	0.0373
1982-10-01	0.4870
1983-01-01	0.1157
1983-04-01	0.3327
1983-07-01	1.2733
1983-10-01	0.1790
1984-01-01	0.5275
1984-04-01	0.2021
1984-07-01	0.4355
1984-10-01	1.1184
1985-01-01	1.4657
1985-04-01	0.8949
1985-07-01	1.4421
1985-10-01	1.5341
1986-01-01	1.4648
1986-04-01	0.7119
1986-07-01	0.2373
1986-10-01	0.2812
1987-01-01	0.3441
1987-04-01	0.4689
1987-07-01	0.5713
1987-10-01	0.4471
1988-01-01	0.6168
1988-04-01	0.4961
1988-07-01	0.6943
1988-10-01	0.5094
1989-01-01	0.5332
1989-04-01	0.1000
1989-07-01	0.6786
1989-10-01	0.4883
1990-01-01	0.3450
1990-04-01	1.3689
1990-07-01	0.6700
1990-10-01	1.2204
1991-01-01	1.1974
1991-04-01	1.6193
1991-07-01	0.3660
1991-10-01	0.7032
1992-01-01	1.3086
1992-04-01	0.7516
1992-07-01	1.5030
1992-10-01	4.4912
1993-01-01	1.4559
1993-04-01	2.7646
1993-07-01	2.4449
1993-10-01	6.5732
1994-01-01	4.2941
1994-04-01	5.0173
1994-07-01	5.7138
1994-10-01	1.8378
1995-01-01	2.4882
1995-04-01	2.4262
1995-07-01	6.3190
1995-10-01	3.7615
1996-01-01	6.3571
1996-04-01	8.2524
1996-07-01	9.4672
1996-10-01	11.2051
1997-01-01	8.8475
1997-04-01	11.4102
1997-07-01	10.8002
1997-10-01	3.6954
1998-01-01	2.0341
1998-04-01	6.5647
1998-07-01	0.5123
1998-10-01	2.5862
1999-01-01	3.7369
1999-04-01	5.1580
1999-07-01	3.7115
1999-10-01	4.8068
2000-01-01	6.9968
2000-04-01	2.7104
2000-07-01	2.9609
2000-10-01	2.5571
2001-01-01	2.7047
2001-04-01	4.8893
2001-07-01	1.7955
2001-10-01	8.2356
2002-01-01	7.1166
2002-04-01	12.0843
2002-07-01	6.7956
2002-10-01	14.8709
2003-01-01	12.9308
2003-04-01	13.0188
2003-07-01	9.2977
2003-10-01	8.1336
2004-01-01	13.8810
2004-04-01	12.0495
2004-07-01	10.1962
2004-10-01	9.8782
2005-01-01	8.1792
2005-04-01	9.0654
2005-07-01	12.1241
2005-10-01	11.0636
2006-01-01	14.7938
2006-04-01	8.3547
2006-07-01	10.6483
2006-10-01	11.5080
2007-01-01	14.4783
2007-04-01	20.9913
2007-07-01	7.2617
2007-10-01	10.9302
2008-01-01	7.9984
2008-04-01	12.2604
2008-07-01	5.3492
2008-10-01	2.6348
2009-01-01	12.9001
2009-04-01	14.9005
2009-07-01	19.3789
2009-10-01	12.4056
2010-01-01	13.2737
2010-04-01	9.7389
2010-07-01	15.3984
2010-10-01	16.9917
2011-01-01	18.4862
2011-04-01	25.3261
2011-07-01	14.8661
2011-10-01	13.1040
2012-01-01	26.0533
2012-04-01	33.7797
2012-07-01	22.3698
2012-10-01	22.1600
2013-01-01	19.9393
2013-04-01	29.5101
2013-07-01	26.8566
2013-10-01	20.2197
2014-01-01	26.8126
2014-04-01	36.6094
2014-07-01	28.3352
2014-10-01	48.0207
2015-01-01	30.6512
2015-04-01	33.3579