Quarter	Billions of US Dollars
1987-01-01	0.1915
1987-07-01	0.1165
1988-01-01	0.1124
1988-04-01	0.1576
1988-07-01	0.1134
1988-10-01	0.0826
1990-07-01	-0.0386
1991-10-01	0.0224
1992-01-01	-0.1555
1992-04-01	0.1109
1992-07-01	0.0700
1992-10-01	0.4000
1993-01-01	-0.2892
1993-04-01	0.3000
1993-07-01	0.6637
1993-10-01	0.3343
1994-01-01	-0.0282
1994-04-01	0.1262
1994-07-01	0.2800
1994-10-01	0.5465
1995-01-01	-0.3117
1995-07-01	0.7392
1995-10-01	-0.3700
1996-01-01	-0.8127
1996-04-01	-0.0520
1996-07-01	0.7145
1996-10-01	0.4654
1997-01-01	0.0895
1997-04-01	1.4580
1997-07-01	0.4154
1997-10-01	-0.2418
1998-01-01	0.4450
1998-04-01	0.0930
1998-07-01	-0.2172
1998-10-01	-0.3119
1999-01-01	-0.0500
1999-04-01	-0.0875
1999-07-01	0.2148
1999-10-01	-0.4370
2000-01-01	-0.0890
2000-04-01	0.0110
2000-07-01	-0.5236
2000-10-01	0.2615
2001-01-01	-0.1476
2001-04-01	0.6086
2001-07-01	-0.7071
2001-10-01	-0.2080
2002-01-01	0.6295
2002-04-01	0.4669
2002-07-01	-0.3350
2002-10-01	-0.0212
2003-01-01	-0.5978
2003-04-01	0.0856
2003-07-01	0.0174
2003-10-01	1.0256
2004-01-01	-0.1077
2004-04-01	-0.0915
2004-07-01	0.2730
2004-10-01	0.6613
2005-01-01	0.3673
2005-04-01	0.0929
2005-07-01	0.4479
2005-10-01	0.2634
2006-01-01	0.2991
2006-04-01	1.1662
2006-07-01	0.4336
2006-10-01	1.1039
2007-01-01	0.2810
2007-04-01	3.1237
2007-07-01	0.9430
2007-10-01	0.8464
2008-01-01	-0.4286
2008-04-01	1.9890
2008-07-01	0.3059
2008-10-01	-0.2629
2009-01-01	0.4367
2009-04-01	0.6789
2009-07-01	0.5939
2009-10-01	1.5097
2010-01-01	1.2943
2010-04-01	2.6386
2010-07-01	8.2955
2010-10-01	6.0060
2011-01-01	8.8461
2011-04-01	12.2724
2011-07-01	1.4490
2011-10-01	1.4789
2012-01-01	3.0058
2012-04-01	9.4801
2012-07-01	3.4742
2012-10-01	10.7409
2013-01-01	10.4834
2013-04-01	18.5802
2013-07-01	6.0953
2013-10-01	20.2557
2014-01-01	11.8963
2014-04-01	29.7770
2014-07-01	11.4567
2014-10-01	26.7798
2015-01-01	16.7029
2015-04-01	32.7928