Quarter	Billions of US Dollars
1968-07-01	0.040
1971-01-01	0.086
1971-04-01	0.051
1971-07-01	0.025
1971-10-01	0.081
1972-01-01	0.203
1972-04-01	0.143
1972-07-01	0.219
1972-10-01	0.386
1973-01-01	0.161
1973-04-01	0.392
1973-07-01	0.130
1973-10-01	0.531
1974-01-01	0.180
1974-04-01	0.493
1974-07-01	0.067
1974-10-01	0.166
1975-01-01	0.337
1975-04-01	0.553
1975-07-01	0.187
1975-10-01	0.209
1976-01-01	0.187
1976-04-01	0.459
1976-07-01	0.657
1976-10-01	0.563
1977-01-01	0.654
1977-04-01	0.864
1977-07-01	1.285
1977-10-01	1.488
1978-01-01	1.744
1978-04-01	1.356
1978-07-01	0.901
1978-10-01	1.223
1979-01-01	1.080
1979-04-01	0.731
1979-07-01	0.816
1979-10-01	0.245
1980-01-01	-0.089
1980-04-01	0.609
1980-07-01	0.591
1980-10-01	0.259
1981-01-01	0.165
1981-04-01	0.691
1981-07-01	0.677
1981-10-01	0.973
1982-01-01	1.037
1982-04-01	0.242
1982-07-01	-0.064
1982-10-01	0.467
1983-01-01	-0.305
1983-04-01	0.126
1983-07-01	1.296
1983-10-01	-0.056
1984-01-01	0.260
1984-04-01	0.071
1984-07-01	0.239
1984-10-01	1.302
1985-01-01	0.988
1985-04-01	2.223
1985-07-01	0.714
1985-10-01	-0.157
1986-01-01	1.149
1986-04-01	0.433
1986-07-01	0.111
1986-10-01	-0.461
1987-01-01	0.270
1987-04-01	-0.252
1987-07-01	-0.145
1987-10-01	-0.202
1988-01-01	0.412
1988-04-01	-0.732
1988-07-01	0.478
1988-10-01	0.825
1989-01-01	0.474
1989-04-01	-0.254
1989-07-01	2.061
1989-10-01	0.769
1990-01-01	36.120
1990-04-01	0.582
1990-07-01	0.860
1990-10-01	16.705
1991-01-01	2.049
1991-04-01	3.953
1991-07-01	1.480
1991-10-01	4.365
1992-01-01	4.599
1992-04-01	2.607
1992-07-01	3.604
1992-10-01	6.171
1993-01-01	3.739
1993-04-01	23.635
1993-07-01	7.142
1993-10-01	24.595
1994-01-01	12.570
1994-04-01	48.386
1994-07-01	13.056
1994-10-01	12.868
1995-01-01	5.200
1995-04-01	5.258
1995-07-01	12.229
1995-10-01	7.600
1996-01-01	13.182
1996-04-01	17.803
1996-07-01	19.816
1996-10-01	24.107
1997-01-01	25.640
1997-04-01	32.716
1997-07-01	28.542
1997-10-01	8.860
1998-01-01	11.521
1998-04-01	25.655
1998-07-01	6.880
1998-10-01	-22.324
1999-01-01	4.908
1999-04-01	17.253
1999-07-01	2.722
1999-10-01	11.994
2000-01-01	22.072
2000-04-01	0.771
2000-07-01	36.370
2000-10-01	-4.875
2001-01-01	11.345
2001-04-01	-0.218
2001-07-01	3.034
2001-10-01	-0.225
2002-01-01	10.593
2002-04-01	5.476
2002-07-01	3.951
2002-10-01	7.102
2003-01-01	1.815
2003-04-01	9.352
2003-07-01	15.341
2003-10-01	14.642
2004-01-01	24.572
2004-04-01	14.011
2004-07-01	13.718
2004-10-01	20.681
2005-01-01	29.030
2005-04-01	-3.736
2005-07-01	16.449
2005-10-01	33.649
2006-01-01	38.092
2006-04-01	-0.215
2006-07-01	26.669
2006-10-01	62.471
2007-01-01	45.670
2007-04-01	63.761
2007-07-01	5.863
2007-10-01	33.566
2008-01-01	-5.598
2008-04-01	41.135
2008-07-01	10.235
2008-10-01	-23.340
2009-01-01	-2.599
2009-04-01	25.867
2009-07-01	48.276
2009-10-01	56.548
2010-01-01	33.817
2010-04-01	33.022
2010-07-01	66.209
2010-10-01	71.646
2011-01-01	68.032
2011-04-01	63.574
2011-07-01	17.132
2011-10-01	51.293
2012-01-01	79.775
2012-04-01	65.743
2012-07-01	93.742
2012-10-01	102.167
2013-01-01	69.744
2013-04-01	95.981
2013-07-01	62.920
2013-10-01	107.522
2014-01-01	50.422
2014-04-01	99.081
2014-07-01	67.613
2014-10-01	87.424
2015-01-01	47.739
2015-04-01	90.368