Quarter	Billions of US Dollars
1987-01-01	0.2805
1987-04-01	0.6274
1987-07-01	0.5279
1987-10-01	0.1989
1988-01-01	0.0567
1988-04-01	0.7543
1988-07-01	0.9916
1988-10-01	0.8383
1989-01-01	0.6948
1989-04-01	0.5622
1989-07-01	0.7616
1989-10-01	0.3844
1990-01-01	0.1557
1990-04-01	-0.1940
1990-07-01	-0.1358
1990-10-01	-0.1286
1991-01-01	-0.7270
1991-04-01	-0.3125
1991-07-01	-0.5537
1991-10-01	-0.1476
1992-01-01	-0.1415
1992-04-01	-0.1320
1992-07-01	0.0305
1992-10-01	-0.8000
1993-01-01	0.3461
1993-04-01	-1.1199
1993-07-01	0.3025
1993-10-01	0.0683
1994-01-01	0.2031
1994-04-01	0.7441
1994-07-01	-0.5946
1994-10-01	-0.1728
1995-01-01	-0.0230
1995-04-01	0.0385
1995-07-01	-0.0590
1995-10-01	0.8937
1996-01-01	-0.4874
1996-04-01	1.6871
1996-07-01	0.5735
1996-10-01	-0.1144
1997-01-01	1.0165
1997-04-01	1.8291
1997-07-01	0.3932
1997-10-01	0.5336
1998-01-01	0.8856
1998-04-01	2.0201
1998-07-01	-0.4895
1998-10-01	-0.3617
1999-01-01	1.4035
1999-04-01	3.3350
1999-07-01	-1.1280
1999-10-01	0.9831
2000-01-01	2.1507
2000-04-01	-0.9065
2000-07-01	0.1286
2000-10-01	0.6205
2001-01-01	-0.0127
2001-04-01	0.6469
2001-07-01	-0.0185
2001-10-01	2.2912
2002-01-01	3.8409
2002-04-01	6.1426
2002-07-01	5.8382
2002-10-01	3.1610
2003-01-01	1.5225
2003-04-01	6.4501
2003-07-01	5.3531
2003-10-01	8.9674
2004-01-01	2.2127
2004-04-01	-3.7413
2004-07-01	5.3143
2004-10-01	3.5809
2005-01-01	0.1912
2005-04-01	3.2252
2005-07-01	1.9219
2005-10-01	5.3164
2006-01-01	6.4728
2006-04-01	1.1115
2006-07-01	6.2975
2006-10-01	8.3736
2007-01-01	2.3842
2007-04-01	10.0556
2007-07-01	2.1940
2007-10-01	9.6761
2008-01-01	5.6940
2008-04-01	19.6180
2008-07-01	-0.2415
2008-10-01	-0.7504
2009-01-01	11.0064
2009-04-01	14.5197
2009-07-01	2.1253
2009-10-01	14.9656
2010-01-01	0.2350
2010-04-01	9.0637
2010-07-01	2.4913
2010-10-01	9.3470
2011-01-01	-0.8430
2011-04-01	15.7049
2011-07-01	-10.3361
2011-10-01	2.2256
2012-01-01	6.1233
2012-04-01	-17.6947
2012-07-01	1.7277
2012-10-01	-10.2400
2013-01-01	3.2751
2013-04-01	-21.4551
2013-07-01	10.1773
2013-10-01	1.4352
2014-01-01	-7.9755
2014-04-01	-3.2159
2014-07-01	-7.3740
2014-10-01	-8.1604
2015-01-01	-3.1427
2015-04-01	-4.2818