Quarter	Billions of US Dollars
1970-10-01	0.015
1971-01-01	0.025
1971-10-01	0.105
1972-01-01	0.115
1972-04-01	0.143
1972-07-01	0.172
1972-10-01	0.159
1973-01-01	0.429
1973-04-01	0.284
1973-07-01	0.238
1973-10-01	0.184
1974-01-01	0.107
1974-04-01	0.064
1974-07-01	0.040
1974-10-01	0.095
1975-04-01	0.216
1975-07-01	0.110
1975-10-01	0.060
1976-01-01	0.350
1976-04-01	0.322
1976-07-01	0.100
1976-10-01	0.210
1977-01-01	0.188
1977-04-01	0.271
1977-07-01	0.164
1977-10-01	0.228
1978-01-01	0.408
1978-04-01	0.414
1978-07-01	0.160
1978-10-01	0.006
1979-01-01	0.143
1979-04-01	0.129
1979-07-01	0.031
1979-10-01	0.155
1980-01-01	-0.034
1980-04-01	0.025
1980-07-01	-0.050
1980-10-01	-0.176
1981-01-01	0.005
1981-04-01	-0.130
1981-07-01	-0.078
1981-10-01	-0.160
1982-01-01	-0.013
1982-04-01	-0.093
1982-07-01	-0.050
1982-10-01	0.100
1983-01-01	-0.072
1983-04-01	-0.120
1983-07-01	-0.034
1983-10-01	-0.038
1984-01-01	-0.183
1984-04-01	-0.028
1984-07-01	0.100
1984-10-01	0.262
1985-01-01	-0.123
1985-04-01	0.095
1985-07-01	0.809
1985-10-01	3.932
1986-01-01	0.211
1986-04-01	1.135
1986-07-01	1.304
1986-10-01	0.791
1987-01-01	1.034
1987-04-01	1.282
1987-07-01	0.075
1987-10-01	0.813
1988-01-01	1.069
1988-04-01	2.901
1988-07-01	3.544
1988-10-01	-0.489
1989-01-01	2.942
1989-04-01	0.431
1989-07-01	5.018
1989-10-01	5.124
1990-01-01	5.157
1990-04-01	2.532
1990-07-01	6.924
1990-10-01	5.566
1991-01-01	8.202
1991-04-01	7.220
1991-07-01	6.428
1991-10-01	4.534
1992-01-01	4.613
1992-04-01	4.644
1992-07-01	1.551
1992-10-01	9.855
1993-01-01	2.164
1993-04-01	8.722
1993-07-01	7.255
1993-10-01	7.755
1994-01-01	10.933
1994-04-01	6.226
1994-07-01	7.850
1994-10-01	5.818
1995-01-01	4.573
1995-04-01	7.311
1995-07-01	4.121
1995-10-01	8.793
1996-01-01	12.084
1996-04-01	10.922
1996-07-01	10.194
1996-10-01	19.934
1997-01-01	16.945
1997-04-01	15.768
1997-07-01	15.306
1997-10-01	6.869
1998-01-01	23.889
1998-04-01	19.241
1998-07-01	14.358
1998-10-01	6.474
1999-01-01	35.974
1999-04-01	43.669
1999-07-01	32.498
1999-10-01	23.518
2000-01-01	39.888
2000-04-01	32.917
2000-07-01	18.182
2000-10-01	27.950
2001-01-01	23.596
2001-04-01	30.107
2001-07-01	21.703
2001-10-01	23.870
2002-01-01	11.352
2002-04-01	38.891
2002-07-01	17.547
2002-10-01	29.745
2003-01-01	32.859
2003-04-01	43.470
2003-07-01	60.740
2003-10-01	66.331
2004-01-01	71.715
2004-04-01	63.502
2004-07-01	69.557
2004-10-01	88.199
2005-01-01	81.874
2005-04-01	68.803
2005-07-01	72.654
2005-10-01	107.526
2006-01-01	85.852
2006-04-01	61.437
2006-07-01	97.414
2006-10-01	111.779
2007-01-01	146.135
2007-04-01	160.459
2007-07-01	87.264
2007-10-01	59.243
2008-01-01	21.793
2008-04-01	228.456
2008-07-01	166.511
2008-10-01	282.072
2009-01-01	60.726
2009-04-01	62.141
2009-07-01	61.515
2009-10-01	11.641
2010-01-01	24.258
2010-04-01	-22.755
2010-07-01	31.715
2010-10-01	-47.239
2011-01-01	23.256
2011-04-01	42.541
2011-07-01	-28.945
2011-10-01	-32.235
2012-01-01	44.519
2012-04-01	-44.411
2012-07-01	-51.497
2012-10-01	-16.155
2013-01-01	-25.608
2013-04-01	-58.259
2013-07-01	-28.140
2013-10-01	2.483
2014-01-01	-25.910
2014-04-01	-1.657
2014-07-01	32.001
2014-10-01	-18.008
2015-01-01	3.395
2015-04-01	17.848