Quarter	Billions of US Dollars
1972-07-01	0.05000
1975-04-01	0.04050
1976-01-01	0.02500
1977-01-01	0.03000
1977-07-01	0.10000
1977-10-01	0.04460
1980-01-01	-0.02500
1980-04-01	0.05000
1981-01-01	-0.03000
1981-04-01	-0.04394
1984-10-01	0.04020
1985-01-01	0.16960
1985-04-01	-0.05000
1985-07-01	0.15250
1985-10-01	-0.08510
1986-01-01	0.16230
1986-04-01	0.25000
1986-07-01	0.07250
1986-10-01	0.05500
1987-01-01	0.27389
1987-10-01	0.27951
1988-01-01	0.31470
1988-07-01	0.22270
1988-10-01	0.27180
1989-01-01	0.38530
1989-04-01	0.10220
1989-07-01	0.26340
1989-10-01	0.10510
1990-01-01	0.25900
1990-04-01	0.11960
1990-07-01	0.20000
1990-10-01	0.36400
1991-01-01	0.12850
1991-04-01	0.05375
1991-07-01	0.10000
1991-10-01	0.84018
1992-01-01	0.53384
1992-04-01	0.05160
1992-07-01	0.20000
1993-01-01	1.19864
1993-04-01	0.64140
1993-07-01	1.19460
1993-10-01	0.61995
1994-01-01	0.96410
1994-04-01	0.14020
1994-07-01	0.50937
1994-10-01	0.68145
1995-01-01	-0.15720
1995-04-01	0.71280
1995-07-01	0.65470
1995-10-01	0.65753
1996-01-01	-0.09208
1996-04-01	-0.04887
1996-07-01	-0.53258
1996-10-01	-0.38314
1997-01-01	-0.01722
1997-04-01	-0.11670
1997-07-01	-0.12719
1997-10-01	-0.35986
1998-01-01	-0.32885
1998-04-01	-0.01050
1998-07-01	0.08248
1998-10-01	0.08332
1999-01-01	-0.13302
1999-04-01	1.22676
1999-07-01	-0.63062
1999-10-01	0.14687
2000-01-01	-0.70133
2000-04-01	-0.52873
2000-07-01	-0.33944
2000-10-01	0.22039
2001-04-01	0.91800
2001-10-01	-0.47152
2002-01-01	-0.50073
2002-04-01	-0.23478
2002-07-01	-0.20000
2003-01-01	0.53262
2003-04-01	-0.65000
2003-07-01	0.30822
2003-10-01	-0.20000
2004-01-01	-0.33243
2004-04-01	0.74839
2004-07-01	0.75605
2004-10-01	1.42760
2005-01-01	2.71222
2005-04-01	1.05243
2005-07-01	0.80120
2005-10-01	0.25134
2006-01-01	4.21712
2006-04-01	-1.14063
2006-07-01	2.24578
2006-10-01	1.95544
2007-01-01	2.71004
2007-04-01	0.84983
2007-10-01	-0.05108
2008-01-01	1.25948
2008-04-01	3.83861
2008-07-01	0.32728
2009-01-01	-1.62725
2009-04-01	-0.46368
2009-07-01	1.54219
2009-10-01	1.40361
2010-01-01	1.12825
2010-04-01	0.19046
2010-07-01	-1.74386
2010-10-01	-0.47544
2011-01-01	2.60063
2011-04-01	0.56294
2011-07-01	0.17356
2011-10-01	-1.20458
2012-01-01	-0.10856
2012-04-01	-0.39564
2012-07-01	0.29027
2012-10-01	-0.09799
2013-01-01	1.32256
2013-04-01	0.30052
2013-07-01	0.52367
2013-10-01	3.00696
2014-01-01	1.76882
2014-04-01	-1.57158
2014-07-01	-3.40982
2014-10-01	1.53320
2015-01-01	-1.64784
2015-04-01	6.13014