Quarter	Billions of US Dollars
1966-01-01	0.01500
1972-01-01	0.05020
1972-04-01	0.01500
1974-07-01	0.03350
1974-10-01	0.08450
1975-01-01	0.03110
1975-04-01	0.08690
1975-07-01	0.28570
1975-10-01	0.03310
1976-04-01	0.15050
1976-07-01	0.07130
1976-10-01	0.19120
1977-01-01	0.02990
1977-04-01	0.23100
1977-07-01	0.17320
1977-10-01	0.11030
1978-01-01	0.30300
1978-04-01	0.17360
1978-10-01	0.31600
1979-01-01	0.09594
1979-04-01	0.15190
1979-07-01	0.15725
1979-10-01	-0.00032
1980-04-01	0.09438
1980-07-01	-0.01159
1980-10-01	0.02500
1981-01-01	0.09670
1981-04-01	0.11430
1981-07-01	-0.00620
1981-10-01	0.24905
1982-01-01	0.44348
1982-04-01	0.17995
1982-07-01	0.03242
1982-10-01	0.48550
1983-01-01	0.28001
1983-04-01	-0.12633
1983-07-01	-0.03784
1984-01-01	0.13550
1984-04-01	0.10499
1984-07-01	0.08378
1984-10-01	0.61564
1985-01-01	0.03380
1985-04-01	0.22466
1985-07-01	0.52210
1985-10-01	-0.07129
1986-01-01	0.50524
1986-04-01	0.51595
1986-07-01	1.00711
1986-10-01	0.32493
1987-01-01	0.54376
1987-04-01	0.41997
1987-07-01	-0.30651
1987-10-01	-0.09106
1988-01-01	-0.35166
1988-04-01	0.87802
1988-07-01	-0.10944
1988-10-01	0.10982
1989-01-01	-0.57022
1989-04-01	-0.03448
1989-07-01	0.02758
1989-10-01	0.32723
1990-01-01	-0.19930
1990-04-01	0.26410
1990-07-01	-0.05532
1990-10-01	-0.32961
1991-01-01	-0.05676
1991-04-01	0.00301
1991-07-01	-0.19693
1991-10-01	-0.74560
1992-01-01	0.06873
1992-04-01	-1.20599
1992-07-01	-0.20736
1992-10-01	-0.32314
1993-01-01	-0.83333
1993-04-01	-0.49780
1993-07-01	0.08186
1993-10-01	-0.17973
1994-01-01	-0.22487
1994-04-01	0.34192
1994-07-01	-0.51102
1994-10-01	0.01662
1995-01-01	-0.38696
1995-04-01	-0.54333
1995-07-01	-0.00127
1995-10-01	-0.00162
1996-01-01	0.15153
1996-04-01	-0.58286
1996-07-01	-0.28193
1996-10-01	-0.34890
1997-01-01	-0.47698
1997-04-01	0.19757
1997-07-01	0.32493
1997-10-01	0.11128
1998-01-01	0.59063
1998-04-01	-0.02411
1998-07-01	-0.08895
1998-10-01	-0.36878
1999-01-01	0.32990
1999-04-01	-0.38943
1999-07-01	0.10796
1999-10-01	-0.04783
2000-01-01	-0.12683
2000-04-01	0.25976
2000-07-01	-0.22211
2000-10-01	-0.20828
2001-01-01	-0.11240
2001-04-01	0.17567
2001-07-01	0.01277
2001-10-01	0.41417
2002-01-01	-0.05990
2002-04-01	0.58915
2002-07-01	-0.19628
2002-10-01	-0.15723
2003-01-01	-0.23372
2003-04-01	0.47864
2003-07-01	-0.07249
2003-10-01	0.16038
2004-01-01	0.07707
2004-04-01	0.16703
2004-07-01	1.92635
2004-10-01	0.55728
2005-01-01	1.92253
2005-04-01	1.13470
2005-07-01	0.12866
2005-10-01	1.35715
2006-01-01	-0.50646
2006-04-01	0.46982
2006-07-01	0.15818
2006-10-01	-1.27104
2007-01-01	-0.60076
2007-04-01	-0.76507
2007-07-01	-0.26716
2007-10-01	-0.09808
2008-01-01	-0.95802
2008-04-01	-0.65507
2008-07-01	0.30222
2008-10-01	-0.21269
2009-01-01	-1.01554
2009-04-01	-0.11042
2009-07-01	-1.92530
2009-10-01	1.61662
2010-01-01	-1.17262
2010-04-01	-0.14135
2010-07-01	0.01361
2010-10-01	3.35000
2011-01-01	2.04492
2011-04-01	0.30463
2011-07-01	2.53913
2011-10-01	0.84280
2012-01-01	1.48149
2012-04-01	-0.27221
2012-07-01	1.67850
2012-10-01	-1.17140
2013-01-01	-0.03533
2013-04-01	1.92626
2013-07-01	0.59857
2013-10-01	-0.51527
2014-01-01	-3.11381
2014-04-01	1.30936
2014-07-01	0.13197
2014-10-01	0.04483
2015-01-01	0.06146
2015-04-01	-0.09059