Quarter	Billions of US Dollars
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	0.20113
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
1998-10-01	0.08332
1999-01-01	-0.71212
1999-04-01	-0.04608
1999-07-01	-0.63062
1999-10-01	-0.38533
2000-01-01	-0.90711
2000-04-01	-0.52873
2000-07-01	-0.33944
2000-10-01	-0.11461
2001-04-01	-0.32978
2001-10-01	-0.47152
2002-01-01	-0.50073
2002-04-01	-0.23478
2002-07-01	-0.20000
2003-01-01	-0.54869
2003-04-01	-0.65000
2003-07-01	-0.73565
2003-10-01	-0.20000
2004-01-01	-1.57189
2004-07-01	-0.15273
2005-01-01	-0.23875
2005-07-01	-0.49444
2005-10-01	-0.30381
2006-01-01	0.72664
2006-04-01	0.11173
2006-07-01	0.02074
2006-10-01	0.66612
2007-04-01	0.03456
2007-07-01	0.00687
2007-10-01	-0.23635
2008-01-01	-0.23763
2008-04-01	0.35142
2009-04-01	-0.01768
2010-04-01	-0.16301
2011-01-01	-0.48602
2011-04-01	0.14300
2011-07-01	0.00865
2011-10-01	0.02474
2012-04-01	0.13000
2012-07-01	0.50000
2012-10-01	0.06500
2013-07-01	0.52367
2013-10-01	-0.21536
2014-01-01	0.21000
2014-04-01	-0.17032
2014-10-01	0.45221
2015-01-01	-0.01126
2015-04-01	6.14928