Quarter	Billions of US Dollars
1987-01-01	0.06190
1988-01-01	0.19800
1988-04-01	0.08020
1988-07-01	0.05000
1988-10-01	0.07940
1989-01-01	0.07870
1989-07-01	0.09000
1989-10-01	0.10000
1990-04-01	0.06540
1992-01-01	0.12810
1992-04-01	-0.05372
1992-10-01	0.12200
1993-04-01	-0.09086
1993-10-01	0.03753
1994-01-01	-0.20427
1994-07-01	0.00860
1994-10-01	0.01410
1995-01-01	-0.09189
1995-04-01	-0.00490
1995-07-01	-0.00610
1995-10-01	-0.06960
1996-01-01	-0.03120
1996-04-01	-0.06775
1996-07-01	-0.02059
1996-10-01	-0.10176
1997-01-01	0.10937
1997-04-01	-0.08423
1997-07-01	0.10722
1997-10-01	0.11161
1998-01-01	-0.02882
1998-04-01	-0.10748
1998-07-01	0.24652
1998-10-01	-0.02600
1999-01-01	-0.00001
1999-04-01	0.00101
1999-07-01	0.00312
1999-10-01	0.22156
2000-01-01	0.41445
2000-04-01	0.13551
2000-07-01	-0.20869
2000-10-01	-0.15880
2001-04-01	-0.01860
2001-07-01	-0.01248
2001-10-01	-0.00972
2002-01-01	-0.12197
2002-04-01	0.08979
2002-07-01	-0.08589
2002-10-01	-0.23573
2003-01-01	-0.09148
2003-04-01	-0.18146
2003-07-01	-0.01155
2003-10-01	-0.01184
2004-01-01	-0.01213
2004-04-01	-0.07945
2004-10-01	-0.17500
2005-01-01	-0.35000
2005-04-01	0.60000
2005-10-01	0.50000
2006-07-01	0.03795
2006-10-01	0.13743
2007-04-01	0.15000
2007-07-01	0.10000
2010-07-01	1.86229
2010-10-01	0.75000
2011-01-01	1.00000
2011-04-01	0.80000
2011-10-01	0.58720
2012-01-01	0.50000
2012-04-01	0.65500
2012-07-01	2.10000
2012-10-01	4.69000
2013-01-01	2.37999
2013-04-01	3.25042
2013-07-01	0.71456
2013-10-01	3.27688
2014-01-01	0.17423
2014-04-01	5.41443
2014-07-01	3.96646
2014-10-01	3.49369
2015-01-01	2.53534
2015-04-01	0.03294