Quarter	Billions of US Dollars
1978-01-01	0.0247
1978-04-01	0.0729
1978-07-01	0.0787
1978-10-01	0.0787
1979-01-01	0.1046
1979-04-01	0.1831
1979-07-01	0.2483
1979-10-01	0.2423
1980-01-01	0.2358
1980-04-01	0.2963
1980-07-01	0.2990
1980-10-01	0.3033
1981-01-01	0.2960
1981-04-01	0.2838
1981-07-01	0.3234
1981-10-01	0.3341
1982-01-01	0.3536
1982-04-01	0.3472
1982-07-01	0.3353
1982-10-01	0.3638
1983-01-01	0.3556
1983-04-01	0.3553
1983-07-01	0.4611
1983-10-01	0.4656
1984-01-01	0.5799
1984-04-01	0.4813
1984-07-01	0.5112
1984-10-01	0.5027
1985-01-01	0.9006
1985-04-01	0.9460
1985-07-01	1.0287
1985-10-01	1.3627
1986-01-01	1.4216
1986-04-01	1.4117
1986-07-01	1.3959
1986-10-01	1.3785
1987-01-01	1.4267
1987-04-01	1.4219
1987-07-01	1.4240
1987-10-01	1.5316
1988-01-01	1.5188
1988-04-01	1.4059
1988-07-01	1.6278
1988-10-01	1.6785
1989-01-01	1.6298
1989-04-01	1.5123
1989-07-01	1.7363
1989-10-01	1.7422
1990-01-01	1.6005
1990-04-01	1.3242
1990-07-01	1.3221
1990-10-01	1.3377
1991-01-01	1.1998
1991-04-01	1.1897
1991-07-01	1.0510
1991-10-01	1.0266
1992-01-01	1.2879
1992-04-01	1.3220
1992-07-01	1.4650
1992-10-01	1.4394
1993-01-01	1.7821
1993-04-01	2.0622
1993-07-01	3.3694
1993-10-01	4.5249
1994-01-01	6.0782
1994-04-01	6.2783
1994-07-01	6.7804
1994-10-01	7.0696
1995-01-01	7.4406
1995-04-01	7.7586
1995-07-01	7.9756
1995-10-01	8.4190
1996-01-01	9.5819
1996-04-01	10.3700
1996-07-01	12.1524
1996-10-01	13.1631
1997-01-01	13.7450
1997-04-01	15.0176
1997-07-01	15.1139
1997-10-01	14.8876
1998-01-01	14.7580
1998-04-01	14.5978
1998-07-01	14.6529
1998-10-01	15.1183
1999-01-01	14.5407
1999-04-01	14.4671
1999-07-01	13.9744
1999-10-01	13.9836
2000-01-01	13.6022
2000-04-01	13.4454
2000-07-01	13.1066
2000-10-01	12.6344
2001-01-01	11.7914
2001-04-01	11.5538
2001-07-01	10.3661
2001-10-01	9.8197
2002-01-01	9.4667
2002-04-01	9.3189
2002-07-01	8.9882
2002-10-01	8.9587
2003-01-01	8.8383
2003-04-01	8.7898
2003-07-01	8.7315
2003-10-01	8.1573
2004-01-01	7.3601
2004-04-01	8.1153
2004-07-01	8.4700
2004-10-01	8.4906
2005-01-01	8.6622
2005-04-01	9.7431
2005-07-01	9.9133
2005-10-01	10.1898
2006-01-01	10.1400
2006-04-01	10.3187
2006-07-01	10.6167
2006-10-01	10.9083
2007-01-01	10.2875
2007-04-01	9.2061
2007-07-01	9.2297
2007-10-01	9.1463
2008-01-01	9.4991
2008-04-01	9.2867
2008-07-01	9.2638
2008-10-01	8.8781
2009-01-01	8.5786
2009-04-01	8.1923
2009-07-01	8.0064
2009-10-01	7.8367
2010-01-01	7.6041
2010-04-01	7.3169
2010-07-01	8.1480
2010-10-01	9.2617
2011-01-01	9.5641
2011-04-01	10.2227
2011-07-01	9.8379
2011-10-01	10.1898
2012-01-01	11.6347
2012-04-01	12.1050
2012-07-01	14.4187
2012-10-01	16.4522
2013-01-01	17.4818
2013-04-01	17.2660
2013-07-01	17.7829
2013-10-01	18.4104
2014-01-01	18.7399
2014-04-01	21.5121
2014-07-01	21.1331
2014-10-01	20.9305
2015-01-01	20.9748
2015-04-01	20.2751