Quarter	Billions of US Dollars
1967-04-01	0.0250
1968-04-01	0.0300
1968-10-01	0.0200
1969-10-01	0.0500
1970-01-01	0.0274
1971-01-01	0.0556
1971-04-01	0.0700
1972-10-01	0.0500
1974-10-01	0.0099
1975-01-01	0.0098
1977-01-01	0.0276
1977-04-01	0.0869
1977-10-01	0.0750
1978-01-01	0.0262
1978-04-01	0.1232
1979-01-01	0.0358
1979-04-01	0.0500
1979-07-01	0.1000
1979-10-01	0.0364
1980-01-01	0.2000
1980-04-01	0.3600
1980-07-01	0.2786
1980-10-01	0.1438
1981-01-01	0.3465
1981-07-01	0.0689
1981-10-01	0.4388
1982-01-01	0.8487
1982-04-01	0.2832
1982-10-01	0.6251
1983-01-01	0.1521
1983-04-01	0.1378
1983-07-01	0.1247
1983-10-01	0.8500
1984-01-01	0.4345
1984-04-01	0.1782
1984-07-01	0.5415
1984-10-01	1.6334
1985-01-01	1.0962
1985-04-01	1.9463
1985-07-01	0.6828
1985-10-01	0.6480
1986-01-01	0.8673
1986-04-01	1.6217
1986-07-01	0.4549
1986-10-01	0.4096
1987-01-01	0.1866
1987-04-01	0.9258
1987-07-01	1.0662
1987-10-01	3.2013
1988-01-01	1.1539
1988-04-01	0.0776
1988-07-01	2.4228
1988-10-01	0.2434
1989-01-01	1.0000
1989-04-01	1.8665
1989-10-01	2.3284
1990-01-01	3.2284
1990-04-01	2.0567
1990-07-01	0.2502
1990-10-01	3.7127
1991-01-01	5.7532
1991-04-01	0.1756
1991-07-01	0.4895
1991-10-01	0.2680
1992-01-01	3.0452
1992-04-01	1.1884
1992-07-01	0.2000
1992-10-01	0.1500
1993-01-01	3.1916
1993-04-01	2.8306
1993-07-01	7.9495
1993-10-01	0.3779
1994-01-01	2.9512
1994-04-01	0.5273
1994-07-01	4.3992
1994-10-01	4.8607
1995-01-01	0.3233
1995-04-01	6.7685
1995-07-01	1.3529
1995-10-01	1.9169
1996-01-01	1.5177
1996-04-01	4.1079
1996-07-01	1.8052
1996-10-01	1.9713
1997-01-01	2.4022
1997-04-01	5.3930
1997-07-01	2.1693
1997-10-01	0.5487
1998-01-01	4.9727
1998-04-01	4.8038
1998-07-01	4.1955
1998-10-01	3.0413
1999-01-01	6.8960
1999-04-01	7.3890
1999-07-01	6.2493
1999-10-01	11.1438
2000-01-01	11.4631
2000-04-01	13.5125
2000-07-01	15.1538
2000-10-01	9.4243
2001-01-01	18.4407
2001-04-01	15.7393
2001-07-01	9.7723
2001-10-01	22.3331
2002-01-01	14.7037
2002-04-01	11.4219
2002-07-01	12.9454
2002-10-01	20.4532
2003-01-01	23.1200
2003-04-01	24.2013
2003-07-01	18.1079
2003-10-01	28.7691
2004-01-01	42.5696
2004-04-01	40.8704
2004-07-01	25.3556
2004-10-01	36.4544
2005-01-01	40.9334
2005-04-01	47.1613
2005-07-01	9.1229
2005-10-01	40.7996
2006-01-01	38.3707
2006-04-01	43.7618
2006-07-01	32.4501
2006-10-01	45.5004
2007-01-01	41.9189
2007-04-01	56.9503
2007-07-01	14.0008
2007-10-01	22.7239
2008-01-01	32.8440
2008-04-01	60.9495
2008-07-01	38.7152
2008-10-01	90.7228
2009-01-01	47.9139
2009-04-01	41.2018
2009-07-01	46.6714
2009-10-01	49.9488
2010-01-01	30.4520
2010-04-01	25.1192
2010-07-01	38.7142
2010-10-01	42.7732
2011-01-01	57.1614
2011-04-01	44.0835
2011-07-01	24.9400
2011-10-01	34.4622
2012-01-01	33.8678
2012-04-01	14.2564
2012-07-01	22.0335
2012-10-01	37.6375
2013-01-01	17.9867
2013-04-01	22.3833
2013-07-01	34.6531
2013-10-01	45.7638
2014-01-01	40.3072
2014-04-01	41.0294
2014-07-01	15.1977
2014-10-01	20.0524
2015-01-01	31.5835
2015-04-01	10.2865