Quarter	Billions of US Dollars
1987-01-01	0.31600
1987-04-01	0.38600
1987-07-01	0.44200
1987-10-01	0.49500
1988-01-01	0.55400
1988-04-01	0.53700
1988-07-01	0.54300
1988-10-01	0.51800
1989-01-01	0.47300
1989-04-01	0.45600
1989-07-01	0.39100
1989-10-01	0.36500
1990-01-01	0.25100
1990-04-01	0.26000
1990-07-01	0.15600
1990-10-01	0.09000
1991-01-01	0.07800
1991-04-01	0.06500
1991-07-01	0.02500
1994-07-01	0.00750
1995-04-01	0.01500
1995-10-01	0.63470
1996-01-01	0.12333
1996-04-01	0.27285
1996-07-01	0.17029
1996-10-01	0.16998
1997-01-01	0.55471
1997-04-01	0.55536
1997-07-01	0.68874
1997-10-01	0.53780
1998-01-01	0.63754
1998-04-01	0.26350
1998-07-01	0.27118
1998-10-01	0.32196
1999-01-01	0.64024
1999-04-01	0.51427
1999-07-01	0.54714
1999-10-01	1.44961
2000-01-01	1.83235
2000-04-01	0.79269
2000-07-01	0.53727
2000-10-01	0.91971
2001-01-01	0.71140
2001-04-01	0.66435
2001-07-01	1.46150
2001-10-01	2.61039
2002-01-01	1.79032
2002-04-01	0.92627
2002-07-01	1.19896
2002-10-01	1.32154
2003-01-01	1.74243
2003-04-01	2.61940
2003-07-01	4.53897
2003-10-01	3.25684
2004-01-01	2.61903
2004-04-01	3.01636
2004-07-01	2.31574
2004-10-01	1.93539
2005-01-01	1.12883
2005-04-01	0.62086
2005-07-01	0.33270
2005-10-01	0.67271
2006-01-01	0.04812
2006-04-01	0.47345
2006-07-01	0.30952
2006-10-01	1.20633
2007-01-01	0.10740
2007-04-01	1.03512
2007-07-01	1.05986
2007-10-01	1.43154
2008-01-01	1.61135
2008-04-01	3.06188
2008-07-01	2.63523
2008-10-01	3.88598
2009-01-01	1.67343
2009-04-01	1.68893
2009-07-01	2.64703
2009-10-01	6.16003
2010-01-01	7.79801
2010-04-01	4.91220
2010-07-01	5.10074
2010-10-01	2.55960
2011-01-01	2.17416
2011-04-01	2.21527
2011-07-01	2.60269
2011-10-01	2.96217
2012-01-01	0.36952
2012-04-01	0.20137
2012-07-01	0.11861
2012-10-01	3.50714
2013-01-01	2.72262
2013-04-01	2.04359
2013-07-01	2.17332
2013-10-01	2.04515
2014-01-01	0.55866
2014-04-01	0.61114
2014-07-01	0.33805
2014-10-01	0.25458
2015-01-01	0.18078
2015-04-01	0.13067