Quarter	Billions of US Dollars
1980-07-01	0.0250
1982-01-01	0.0429
1982-04-01	0.0205
1983-04-01	0.0400
1983-07-01	0.0202
1984-10-01	0.0830
1985-01-01	0.1157
1985-04-01	0.1289
1985-07-01	0.2945
1985-10-01	0.2061
1986-01-01	0.3527
1986-04-01	0.3889
1986-07-01	0.3289
1986-10-01	0.1563
1987-01-01	0.1915
1987-04-01	0.2000
1987-07-01	0.2163
1987-10-01	0.3644
1988-01-01	0.2299
1988-04-01	0.1576
1988-07-01	0.2390
1988-10-01	0.1936
1989-04-01	0.1538
1989-10-01	0.1000
1990-07-01	-0.0386
1991-07-01	0.1429
1991-10-01	0.0224
1992-01-01	-0.1555
1992-04-01	0.0480
1992-07-01	0.2189
1992-10-01	0.1564
1993-01-01	-0.2892
1993-04-01	0.3362
1993-07-01	1.3409
1993-10-01	0.6671
1994-01-01	1.4718
1994-04-01	0.4218
1994-07-01	1.2187
1994-10-01	0.6685
1995-01-01	-0.1412
1995-04-01	-0.2369
1995-07-01	0.7592
1995-10-01	-0.1877
1996-01-01	-0.2213
1996-04-01	-0.2379
1996-07-01	1.5244
1996-10-01	0.7454
1997-01-01	0.7365
1997-04-01	2.6054
1997-07-01	0.3982
1997-10-01	0.1982
1998-01-01	0.3440
1998-04-01	-0.4758
1998-07-01	-0.9265
1998-10-01	0.5372
1999-01-01	-0.4500
1999-04-01	0.2521
1999-07-01	-0.2401
1999-10-01	0.3682
2000-01-01	-0.2891
2000-04-01	0.0373
2000-07-01	-0.3171
2000-10-01	0.8476
2001-01-01	-0.2328
2001-04-01	1.9242
2001-07-01	-1.1966
2001-10-01	0.1555
2002-01-01	1.5259
2002-04-01	-0.2735
2002-07-01	-0.5537
2002-10-01	-0.9503
2003-01-01	-0.9055
2003-04-01	0.2539
2003-07-01	0.4413
2003-10-01	2.6934
2004-01-01	-0.9333
2004-04-01	-0.3630
2004-07-01	1.0284
2004-10-01	3.2342
2005-01-01	0.2853
2005-04-01	-0.1020
2005-07-01	1.9930
2005-10-01	1.1016
2006-01-01	0.1017
2006-04-01	0.7020
2006-07-01	-0.1914
2006-10-01	1.1113
2007-01-01	2.0896
2007-04-01	5.6489
2007-07-01	2.6116
2007-10-01	0.5253
2008-01-01	0.1425
2008-04-01	2.3189
2008-07-01	2.4549
2008-10-01	-0.4051
2009-01-01	-0.8691
2009-04-01	0.5828
2009-07-01	0.1467
2009-10-01	1.4062
2010-01-01	2.8736
2010-04-01	3.2781
2010-07-01	7.7214
2010-10-01	9.6455
2011-01-01	10.5041
2011-04-01	17.5661
2011-07-01	5.2284
2011-10-01	4.6024
2012-01-01	3.2438
2012-04-01	18.3184
2012-07-01	5.2425
2012-10-01	12.9971
2013-01-01	13.2643
2013-04-01	23.6479
2013-07-01	6.8911
2013-10-01	27.8365
2014-01-01	19.4445
2014-04-01	40.4355
2014-07-01	22.6942
2014-10-01	50.8416
2015-01-01	20.2487
2015-04-01	39.9643