Quarter	Billions of US Dollars
1971-01-01	0.0100
1972-04-01	0.0259
1973-01-01	0.0234
1973-04-01	0.0906
1974-01-01	0.0049
1975-07-01	0.0377
1975-10-01	0.0192
1976-07-01	0.0747
1976-10-01	0.1150
1977-01-01	0.0200
1977-07-01	0.0576
1977-10-01	0.0287
1978-07-01	0.0172
1979-01-01	0.0292
1979-07-01	0.9317
1979-10-01	0.5069
1980-04-01	0.0090
1980-10-01	0.1087
1981-01-01	0.0778
1981-04-01	0.0039
1981-07-01	0.0469
1981-10-01	0.0467
1982-01-01	0.0533
1982-04-01	0.0496
1982-07-01	0.0380
1983-01-01	0.1907
1983-04-01	0.1500
1983-07-01	0.0829
1983-10-01	0.4536
1984-01-01	0.1435
1984-04-01	0.4877
1984-07-01	0.4489
1984-10-01	0.4809
1985-01-01	0.4352
1985-04-01	0.7518
1985-07-01	0.2269
1985-10-01	0.6157
1986-01-01	1.0062
1986-04-01	0.9591
1986-07-01	0.8065
1986-10-01	0.3000
1987-01-01	0.4937
1987-04-01	0.8591
1987-07-01	0.4821
1987-10-01	0.5590
1988-01-01	0.8880
1988-04-01	0.2500
1988-07-01	0.2476
1988-10-01	0.3380
1989-01-01	0.4282
1989-04-01	0.6362
1989-07-01	0.1597
1989-10-01	0.4000
1990-01-01	0.6572
1990-04-01	0.8945
1990-07-01	0.2903
1990-10-01	0.0096
1991-01-01	2.3111
1991-04-01	0.3704
1991-07-01	0.6000
1991-10-01	0.3817
1992-01-01	0.3102
1992-04-01	0.1357
1992-07-01	0.2291
1992-10-01	1.1840
1993-01-01	0.7406
1993-04-01	0.6830
1993-07-01	0.7541
1993-10-01	0.5735
1994-01-01	0.7100
1994-04-01	1.6727
1994-07-01	0.9409
1994-10-01	1.0339
1995-01-01	1.5317
1995-04-01	1.3399
1995-07-01	0.3892
1995-10-01	0.5895
1996-01-01	0.6250
1996-04-01	0.8534
1996-07-01	1.1356
1996-10-01	0.0270
1997-01-01	0.5042
1997-04-01	0.7072
1997-07-01	1.8621
1997-10-01	1.1286
1998-01-01	0.2200
1998-04-01	0.3494
1998-07-01	0.3884
1998-10-01	0.1599
1999-04-01	0.1001
1999-07-01	0.0322
1999-10-01	0.3972
2000-01-01	1.2854
2000-04-01	0.0974
2000-07-01	0.9750
2000-10-01	0.4228
2001-01-01	5.0959
2001-04-01	4.4434
2001-07-01	1.6766
2001-10-01	0.8243
2002-01-01	4.6216
2002-04-01	0.9065
2002-07-01	0.8316
2002-10-01	1.1227
2003-01-01	0.8140
2003-04-01	1.4277
2003-07-01	0.5474
2003-10-01	2.7194
2004-01-01	1.0636
2004-04-01	2.3345
2004-07-01	1.6093
2004-10-01	1.0581
2005-01-01	0.7671
2005-04-01	1.6193
2005-07-01	0.1230
2005-10-01	2.2206
2006-01-01	5.3336
2006-04-01	1.2701
2006-07-01	3.1423
2006-10-01	5.5827
2007-01-01	4.7476
2007-04-01	16.1494
2007-07-01	4.9105
2007-10-01	7.0555
2008-01-01	0.3453
2008-04-01	18.8655
2008-07-01	6.7223
2008-10-01	19.5838
2009-01-01	13.0884
2009-04-01	16.7976
2009-07-01	4.0992
2009-10-01	8.0954
2010-01-01	8.3385
2010-04-01	9.8713
2010-07-01	8.5616
2010-10-01	0.6159
2011-01-01	1.2840
2011-04-01	3.7297
2011-07-01	0.1411
2011-10-01	1.4590
2012-01-01	2.9175
2012-04-01	5.8200
2012-07-01	10.8257
2012-10-01	0.3879
2013-01-01	10.3979
2013-04-01	3.5414
2013-07-01	10.7553
2013-10-01	3.0790
2014-01-01	7.8177
2014-04-01	2.8060
2014-07-01	1.8593
2014-10-01	2.8109
2015-01-01	5.0092
2015-04-01	5.3710