Quarter	Billions of US Dollars
1971-01-01	0.040
1971-04-01	0.040
1971-07-01	0.002
1971-10-01	0.002
1972-01-01	0.096
1972-04-01	0.098
1972-07-01	0.026
1972-10-01	0.025
1973-01-01	0.074
1973-04-01	0.012
1974-01-01	0.167
1974-04-01	0.027
1974-07-01	0.256
1974-10-01	0.164
1975-01-01	0.643
1975-04-01	0.523
1975-07-01	0.317
1975-10-01	0.494
1976-01-01	0.922
1976-04-01	0.945
1976-07-01	0.509
1976-10-01	0.574
1977-01-01	0.452
1977-04-01	0.296
1977-07-01	0.227
1977-10-01	0.677
1978-01-01	0.412
1978-04-01	0.464
1978-07-01	0.353
1978-10-01	0.081
1979-01-01	0.358
1979-04-01	0.649
1979-07-01	0.545
1979-10-01	0.510
1980-01-01	0.087
1980-04-01	0.559
1980-07-01	0.217
1980-10-01	0.773
1981-01-01	0.808
1981-04-01	0.208
1981-07-01	0.169
1981-10-01	0.506
1982-01-01	1.885
1982-04-01	1.885
1982-07-01	1.763
1982-10-01	1.538
1983-01-01	1.975
1983-04-01	1.528
1983-07-01	0.544
1983-10-01	1.331
1984-01-01	2.107
1984-04-01	0.719
1984-07-01	2.496
1984-10-01	1.448
1985-01-01	2.013
1985-04-01	0.454
1985-07-01	1.477
1985-10-01	-0.192
1986-01-01	-0.015
1986-04-01	1.924
1986-07-01	1.216
1986-10-01	1.156
1987-01-01	0.592
1987-04-01	0.930
1987-07-01	-0.457
1987-10-01	0.075
1988-01-01	2.192
1988-04-01	2.934
1988-07-01	1.968
1988-10-01	0.639
1989-01-01	2.303
1989-04-01	1.290
1989-07-01	1.077
1989-10-01	1.613
1990-01-01	2.170
1990-04-01	1.702
1990-07-01	3.123
1990-10-01	1.567
1991-01-01	2.981
1991-04-01	4.626
1991-07-01	3.635
1991-10-01	6.009
1992-01-01	5.518
1992-04-01	4.156
1992-07-01	1.998
1992-10-01	6.663
1993-01-01	4.373
1993-04-01	1.797
1993-07-01	9.184
1993-10-01	6.015
1994-01-01	6.188
1994-04-01	0.938
1994-07-01	3.061
1994-10-01	2.751
1995-01-01	-0.441
1995-04-01	0.630
1995-07-01	0.646
1995-10-01	4.099
1996-01-01	-0.364
1996-04-01	2.503
1996-07-01	5.242
1996-10-01	2.179
1997-01-01	3.971
1997-04-01	2.329
1997-07-01	2.566
1997-10-01	0.326
1998-01-01	10.956
1998-04-01	5.476
1998-07-01	4.458
1998-10-01	5.294
1999-01-01	12.950
1999-04-01	15.625
1999-07-01	6.873
1999-10-01	13.509
2000-01-01	9.706
2000-04-01	12.677
2000-07-01	15.780
2000-10-01	11.916
2001-01-01	28.924
2001-04-01	15.944
2001-07-01	16.637
2001-10-01	23.962
2002-01-01	2.399
2002-04-01	17.485
2002-07-01	11.741
2002-10-01	12.631
2003-01-01	24.302
2003-04-01	34.229
2003-07-01	11.496
2003-10-01	21.632
2004-01-01	6.667
2004-04-01	14.661
2004-07-01	15.664
2004-10-01	35.663
2005-01-01	18.178
2005-04-01	34.829
2005-07-01	3.336
2005-10-01	37.884
2006-01-01	25.460
2006-04-01	28.519
2006-07-01	14.962
2006-10-01	69.131
2007-01-01	27.222
2007-04-01	44.861
2007-07-01	0.261
2007-10-01	27.349
2008-01-01	8.878
2008-04-01	69.398
2008-07-01	21.234
2008-10-01	2.881
2009-01-01	34.890
2009-04-01	104.960
2009-07-01	39.290
2009-10-01	43.876
2010-01-01	70.718
2010-04-01	3.874
2010-07-01	37.559
2010-10-01	26.002
2011-01-01	53.768
2011-04-01	19.296
2011-07-01	-8.196
2011-10-01	14.067
2012-01-01	14.668
2012-04-01	-0.201
2012-07-01	-3.081
2012-10-01	1.749
2013-01-01	-16.737
2013-04-01	-1.650
2013-07-01	-5.195
2013-10-01	6.132
2014-01-01	10.123
2014-04-01	11.461
2014-07-01	8.040
2014-10-01	-14.456
2015-01-01	12.940
2015-04-01	-25.990