Quarter	Billions of US Dollars
1987-01-01	0.1915
1987-07-01	0.1165
1988-01-01	0.0824
1988-04-01	0.1576
1988-07-01	0.1064
1988-10-01	0.0826
1990-01-01	0.0321
1990-07-01	-0.0386
1991-04-01	0.0280
1991-10-01	0.0396
1992-01-01	-0.1555
1992-04-01	0.1109
1992-07-01	0.1489
1992-10-01	0.4633
1993-01-01	-0.3223
1993-04-01	0.4224
1993-07-01	0.8067
1993-10-01	1.2936
1994-01-01	0.5614
1994-04-01	0.5058
1994-07-01	0.3690
1994-10-01	0.5139
1995-01-01	-0.3117
1995-04-01	0.2857
1995-07-01	1.2449
1995-10-01	-0.0197
1996-01-01	0.9595
1996-04-01	2.2253
1996-07-01	2.7662
1996-10-01	3.4808
1997-01-01	1.3441
1997-04-01	3.8053
1997-07-01	5.4228
1997-10-01	2.0534
1998-01-01	1.1587
1998-04-01	1.0087
1998-07-01	-0.8352
1998-10-01	-0.1555
1999-01-01	0.0363
1999-04-01	-0.4054
1999-07-01	-0.1158
1999-10-01	-1.7033
2000-01-01	0.3469
2000-04-01	-0.6457
2000-07-01	-1.2174
2000-10-01	1.2602
2001-01-01	-1.3492
2001-04-01	0.0174
2001-07-01	-0.3327
2001-10-01	0.8830
2002-01-01	0.5968
2002-04-01	4.6289
2002-07-01	1.7187
2002-10-01	3.7514
2003-01-01	-0.8246
2003-04-01	0.9187
2003-07-01	2.1641
2003-10-01	3.0687
2004-01-01	1.6438
2004-04-01	0.2865
2004-07-01	1.2712
2004-10-01	4.3453
2005-01-01	2.5031
2005-04-01	1.8659
2005-07-01	1.4581
2005-10-01	1.4640
2006-01-01	4.8709
2006-04-01	2.9233
2006-07-01	3.7723
2006-10-01	7.7893
2007-01-01	1.8213
2007-04-01	7.5313
2007-07-01	0.3742
2007-10-01	0.4898
2008-01-01	0.3111
2008-04-01	4.9220
2008-07-01	4.5149
2008-10-01	-1.7236
2009-01-01	-0.5789
2009-04-01	-0.6782
2009-07-01	10.4700
2009-10-01	1.2302
2010-01-01	-0.5572
2010-04-01	2.7927
2010-07-01	9.9992
2010-10-01	9.8252
2011-01-01	10.7253
2011-04-01	11.5208
2011-07-01	1.4528
2011-10-01	2.3079
2012-01-01	7.6558
2012-04-01	13.2413
2012-07-01	3.8163
2012-10-01	12.9798
2013-01-01	12.7258
2013-04-01	26.7404
2013-07-01	4.8506
2013-10-01	20.8653
2014-01-01	13.9350
2014-04-01	32.6129
2014-07-01	12.9818
2014-10-01	29.0332
2015-01-01	18.9732
2015-04-01	41.1897