Quarter	Billions of US Dollars
1972-07-01	0.0500
1973-01-01	0.0300
1974-04-01	0.0515
1975-01-01	0.0600
1975-04-01	0.0805
1975-10-01	0.0189
1976-01-01	0.0250
1976-04-01	0.0408
1976-07-01	0.0172
1977-01-01	0.0300
1977-04-01	0.0200
1977-07-01	0.1433
1977-10-01	0.1106
1978-04-01	0.0467
1979-04-01	0.0963
1980-04-01	0.0500
1980-07-01	0.0121
1984-07-01	0.0500
1984-10-01	0.0402
1985-01-01	0.1696
1985-04-01	0.0280
1985-07-01	0.2525
1985-10-01	0.0331
1986-01-01	0.4123
1986-04-01	0.1603
1986-07-01	0.0725
1986-10-01	0.1160
1987-01-01	0.4044
1987-07-01	0.3947
1988-01-01	0.7657
1988-04-01	0.5760
1988-07-01	0.6478
1988-10-01	0.4477
1989-01-01	1.1361
1989-04-01	0.4553
1989-07-01	1.0024
1989-10-01	0.4971
1990-01-01	0.7502
1990-04-01	0.4436
1990-07-01	0.5733
1990-10-01	0.2364
1991-01-01	0.1285
1991-04-01	0.4569
1991-07-01	0.6866
1991-10-01	0.8071
1992-01-01	1.0040
1992-04-01	0.5560
1992-07-01	1.0023
1992-10-01	1.7356
1993-01-01	2.7691
1993-04-01	1.2087
1993-07-01	1.6637
1993-10-01	3.5454
1994-01-01	0.7523
1994-04-01	0.4136
1994-07-01	5.7864
1994-10-01	6.6848
1995-01-01	0.2525
1995-04-01	1.5154
1995-07-01	2.6624
1995-10-01	1.1178
1996-01-01	0.5600
1996-04-01	3.5781
1996-07-01	1.6656
1996-10-01	1.3095
1997-01-01	3.6644
1997-04-01	6.0159
1997-07-01	4.3231
1997-10-01	3.1272
1998-01-01	4.1140
1998-04-01	5.9359
1998-07-01	7.3111
1998-10-01	3.5305
1999-01-01	1.9545
1999-04-01	3.4391
1999-07-01	1.0824
1999-10-01	4.8562
2000-01-01	27.8125
2000-04-01	2.7120
2000-07-01	1.5692
2000-10-01	0.9543
2001-01-01	3.2311
2001-04-01	2.0485
2001-07-01	0.3795
2001-10-01	3.9991
2002-01-01	4.4384
2002-04-01	4.2119
2002-07-01	0.4018
2002-10-01	5.1408
2003-01-01	7.4911
2003-04-01	6.8093
2003-07-01	5.8205
2003-10-01	5.1931
2004-01-01	9.9026
2004-04-01	9.3636
2004-07-01	7.7564
2004-10-01	6.0770
2005-01-01	17.2561
2005-04-01	19.7942
2005-07-01	9.8593
2005-10-01	11.1906
2006-01-01	14.6970
2006-04-01	5.3950
2006-07-01	11.1483
2006-10-01	23.7938
2007-01-01	22.3860
2007-04-01	22.1454
2007-07-01	6.4121
2007-10-01	14.0508
2008-01-01	5.1983
2008-04-01	26.6329
2008-07-01	10.1282
2008-10-01	0.4778
2009-01-01	6.9928
2009-04-01	14.0923
2009-07-01	14.6696
2009-10-01	15.3754
2010-01-01	21.2059
2010-04-01	14.4523
2010-07-01	25.2527
2010-10-01	24.2045
2011-01-01	23.8417
2011-04-01	24.7804
2011-07-01	5.7123
2011-10-01	10.3112
2012-01-01	38.1544
2012-04-01	20.9284
2012-07-01	46.0090
2012-10-01	50.4181
2013-01-01	37.5308
2013-04-01	29.9288
2013-07-01	16.7070
2013-10-01	36.8576
2014-01-01	23.0699
2014-04-01	23.3165
2014-07-01	11.5292
2014-10-01	12.0991
2015-01-01	11.6730
2015-04-01	11.1340