Quarter	Billions of US Dollars
1967-04-01	0.0200
1971-01-01	0.0306
1971-10-01	0.0456
1972-01-01	0.0309
1972-07-01	0.0310
1972-10-01	0.0662
1973-01-01	0.0313
1973-04-01	0.0166
1974-07-01	0.0253
1975-01-01	0.0209
1975-04-01	0.0175
1975-07-01	0.0250
1976-01-01	0.0099
1976-04-01	0.0670
1976-07-01	0.0277
1976-10-01	0.1424
1977-01-01	0.2037
1977-04-01	0.1896
1977-07-01	0.0219
1977-10-01	0.1063
1978-04-01	0.2272
1978-07-01	0.0222
1979-01-01	0.2091
1979-04-01	0.1359
1979-07-01	0.0579
1979-10-01	0.0376
1980-01-01	0.1013
1980-04-01	0.1741
1980-07-01	0.0187
1980-10-01	0.0500
1981-04-01	0.1632
1981-10-01	0.1770
1982-01-01	0.1690
1982-04-01	0.3757
1982-10-01	0.0545
1983-01-01	0.3377
1983-04-01	0.1226
1983-07-01	0.1464
1983-10-01	0.4133
1984-01-01	0.5303
1984-07-01	0.0999
1984-10-01	0.6930
1985-01-01	0.6377
1985-04-01	0.3720
1985-10-01	0.1000
1986-01-01	0.0739
1986-04-01	0.1397
1986-07-01	0.7880
1986-10-01	0.2608
1987-01-01	0.0545
1987-04-01	0.2696
1987-07-01	0.1663
1987-10-01	0.0729
1988-01-01	0.5550
1988-07-01	0.2749
1988-10-01	0.3284
1989-01-01	0.0744
1990-01-01	0.0251
1990-04-01	0.4500
1990-07-01	0.6007
1990-10-01	1.0508
1991-04-01	0.3738
1991-10-01	1.0760
1992-01-01	1.1252
1992-04-01	1.7643
1992-07-01	1.5000
1992-10-01	0.2729
1993-01-01	2.6728
1993-04-01	1.8320
1993-10-01	0.5244
1994-01-01	0.0647
1994-04-01	1.0659
1994-07-01	1.6806
1994-10-01	1.9504
1995-01-01	2.0541
1995-04-01	0.4385
1995-07-01	0.3740
1995-10-01	0.2359
1996-01-01	0.1326
1996-04-01	0.6585
1996-07-01	3.4183
1996-10-01	2.4172
1997-01-01	0.8688
1997-04-01	0.2173
1997-07-01	1.6706
1997-10-01	1.0808
1998-01-01	1.3680
1998-04-01	1.9095
1998-07-01	1.9306
1998-10-01	1.8803
1999-01-01	3.7068
1999-04-01	2.9655
1999-07-01	4.4670
1999-10-01	2.0552
2000-01-01	1.9945
2000-04-01	1.7631
2000-07-01	3.6249
2000-10-01	0.8418
2001-01-01	2.7210
2001-04-01	5.1259
2001-07-01	1.7492
2001-10-01	5.5970
2002-01-01	7.7055
2002-04-01	5.9429
2002-07-01	6.9243
2002-10-01	6.8880
2003-01-01	15.4045
2003-04-01	17.3932
2003-07-01	5.4639
2003-10-01	17.5640
2004-01-01	17.8755
2004-04-01	9.9893
2004-07-01	7.4426
2004-10-01	19.6292
2005-01-01	25.8666
2005-04-01	32.4853
2005-07-01	21.2100
2005-10-01	46.4492
2006-01-01	68.3721
2006-04-01	56.6828
2006-07-01	23.5344
2006-10-01	40.0923
2007-01-01	60.7822
2007-04-01	44.2520
2007-07-01	25.7687
2007-10-01	15.7060
2008-01-01	15.7746
2008-04-01	64.6158
2008-07-01	23.0253
2008-10-01	36.0581
2009-01-01	38.2439
2009-04-01	43.8687
2009-07-01	38.8333
2009-10-01	36.7812
2010-01-01	37.2306
2010-04-01	22.4448
2010-07-01	39.0800
2010-10-01	15.7885
2011-01-01	41.4098
2011-04-01	31.6249
2011-07-01	13.8510
2011-10-01	26.7542
2012-01-01	47.8572
2012-04-01	6.7002
2012-07-01	17.5572
2012-10-01	31.0772
2013-01-01	29.9823
2013-04-01	20.7472
2013-07-01	7.0950
2013-10-01	17.5495
2014-01-01	21.7447
2014-04-01	18.0113
2014-07-01	9.7516
2014-10-01	12.5761
2015-01-01	21.1402
2015-04-01	9.6881