Quarter	Billions of US Dollars
1971-01-01	0.0150
1972-01-01	0.0728
1972-07-01	0.0276
1972-10-01	0.0293
1973-01-01	0.0496
1973-04-01	0.0491
1973-07-01	0.0100
1974-01-01	0.0147
1974-07-01	0.0083
1974-10-01	0.0414
1975-01-01	0.1599
1975-04-01	0.2024
1975-07-01	0.2308
1975-10-01	0.5208
1976-01-01	0.4941
1976-04-01	0.2685
1976-07-01	0.2436
1976-10-01	0.3014
1977-01-01	0.7612
1977-04-01	0.8574
1977-07-01	0.1841
1977-10-01	0.7915
1978-01-01	0.8535
1978-04-01	0.7683
1978-07-01	0.2498
1978-10-01	0.7326
1979-01-01	0.6818
1979-04-01	0.4105
1979-07-01	0.5222
1979-10-01	0.1836
1980-01-01	0.4101
1980-04-01	0.0596
1980-07-01	-0.0954
1980-10-01	-0.2115
1981-01-01	-0.2817
1981-04-01	-0.1450
1981-07-01	-0.0186
1981-10-01	0.1927
1982-01-01	-0.5095
1982-04-01	-0.1569
1982-07-01	0.1980
1982-10-01	-0.1535
1983-01-01	-0.1966
1983-04-01	-0.4082
1983-07-01	0.0661
1983-10-01	-0.2581
1984-01-01	0.0201
1984-04-01	-0.1083
1984-07-01	0.0972
1984-10-01	0.3151
1985-01-01	0.0191
1985-04-01	0.1114
1985-07-01	0.7394
1985-10-01	-0.7316
1986-01-01	0.3668
1986-04-01	0.7361
1986-07-01	1.3800
1986-10-01	0.9217
1987-01-01	1.1467
1987-04-01	0.9361
1987-07-01	-0.2236
1987-10-01	-0.2656
1988-01-01	1.1850
1988-04-01	1.5484
1988-07-01	0.6080
1988-10-01	0.1277
1989-01-01	1.0770
1989-04-01	0.0009
1989-07-01	-0.1010
1989-10-01	0.2491
1990-01-01	-0.4366
1990-04-01	-0.3644
1990-07-01	-0.5342
1990-10-01	-0.2842
1991-01-01	-0.6375
1991-04-01	-0.3856
1991-07-01	0.6408
1991-10-01	-0.0279
1992-01-01	0.7035
1992-04-01	1.1811
1992-07-01	-0.4279
1992-10-01	-0.5839
1993-01-01	-0.2547
1993-04-01	0.7086
1993-07-01	-0.5502
1993-10-01	-0.3396
1994-01-01	-0.6608
1994-04-01	-0.2580
1994-07-01	0.1125
1994-10-01	-0.4822
1995-01-01	-0.5869
1995-04-01	-0.8481
1995-07-01	0.1299
1995-10-01	0.1249
1996-01-01	0.2474
1996-04-01	0.5992
1996-07-01	-0.7067
1996-10-01	0.7018
1997-01-01	-0.7541
1997-04-01	-0.5387
1997-07-01	3.7614
1997-10-01	1.0011
1998-01-01	0.8296
1998-04-01	2.5673
1998-07-01	0.3888
1998-10-01	1.1806
1999-01-01	1.0443
1999-04-01	1.9292
1999-07-01	0.4129
1999-10-01	0.5648
2000-01-01	1.6413
2000-04-01	2.6257
2000-07-01	-0.1987
2000-10-01	0.7988
2001-01-01	1.6327
2001-04-01	1.1930
2001-07-01	0.6277
2001-10-01	1.5730
2002-01-01	1.5532
2002-04-01	1.7812
2002-07-01	-0.9515
2002-10-01	1.7028
2003-01-01	2.2335
2003-04-01	1.7056
2003-07-01	3.4008
2003-10-01	2.2136
2004-01-01	1.6366
2004-04-01	2.8828
2004-07-01	0.8683
2004-10-01	3.2876
2005-01-01	3.0888
2005-04-01	1.7942
2005-07-01	0.6115
2005-10-01	4.2803
2006-01-01	2.7199
2006-04-01	8.6669
2006-07-01	6.9253
2006-10-01	8.2697
2007-01-01	5.4676
2007-04-01	1.4667
2007-07-01	5.2709
2007-10-01	6.0505
2008-01-01	8.3239
2008-04-01	16.4889
2008-07-01	2.7759
2008-10-01	-1.4341
2009-01-01	5.0269
2009-04-01	5.3360
2009-07-01	2.4386
2009-10-01	3.2072
2010-01-01	7.5715
2010-04-01	6.4693
2010-07-01	5.5142
2010-10-01	1.5587
2011-01-01	15.3530
2011-04-01	2.3706
2011-07-01	2.4753
2011-10-01	6.9994
2012-01-01	14.9453
2012-04-01	10.2377
2012-07-01	2.2037
2012-10-01	6.5365
2013-01-01	5.6781
2013-04-01	8.8712
2013-07-01	2.9772
2013-10-01	7.3322
2014-01-01	0.4691
2014-04-01	-2.8686
2014-07-01	-2.2826
2014-10-01	3.5867
2015-01-01	5.8521
2015-04-01	-9.2292