Quarter	Billions of US Dollars
1972-01-01	0.0200
1972-04-01	0.0400
1972-07-01	0.0400
1972-10-01	0.0400
1973-01-01	0.0400
1973-04-01	0.0400
1973-07-01	0.0400
1973-10-01	0.0400
1974-01-01	0.0400
1974-04-01	0.0400
1974-07-01	0.0490
1974-10-01	0.0490
1975-01-01	0.0490
1975-04-01	0.0490
1975-07-01	0.0490
1975-10-01	0.0490
1976-01-01	0.0490
1976-04-01	0.0490
1976-07-01	0.0490
1976-10-01	0.0629
1977-01-01	0.0629
1977-04-01	0.0649
1977-07-01	0.0899
1977-10-01	0.0903
1978-01-01	0.1836
1978-04-01	0.1876
1978-07-01	0.2620
1978-10-01	0.3026
1979-01-01	0.3755
1979-04-01	0.3718
1979-07-01	0.3689
1979-10-01	0.3627
1980-01-01	0.3584
1980-04-01	0.3533
1980-07-01	0.3808
1980-10-01	0.3847
1981-01-01	0.3800
1981-04-01	0.3717
1981-07-01	0.3685
1981-10-01	0.3743
1982-01-01	0.3487
1982-04-01	0.3459
1982-07-01	0.3154
1982-10-01	0.3277
1983-01-01	0.3164
1983-04-01	0.3162
1983-07-01	0.3182
1983-10-01	0.3199
1984-01-01	0.3038
1984-04-01	0.2971
1984-07-01	0.2928
1984-10-01	0.2897
1985-01-01	0.2892
1985-04-01	0.2908
1985-07-01	0.3075
1985-10-01	0.2631
1986-01-01	0.2584
1986-04-01	0.2714
1986-07-01	0.2837
1986-10-01	0.2651
1987-01-01	0.2803
1987-04-01	0.2777
1987-07-01	0.2520
1987-10-01	0.2877
1988-01-01	0.1905
1988-04-01	0.1827
1988-07-01	0.1802
1988-10-01	0.1893
1989-01-01	0.1825
1989-04-01	0.1713
1989-07-01	0.1754
1989-10-01	0.1722
1990-01-01	0.1617
1990-04-01	0.1648
1990-07-01	0.1525
1990-10-01	0.1375
1991-01-01	0.1316
1991-04-01	0.1343
1991-07-01	0.1390
1991-10-01	0.1468
1992-01-01	0.1386
1992-04-01	0.1465
1992-07-01	0.1536
1992-10-01	0.1473
1993-01-01	0.1141
1993-04-01	0.1234
1993-07-01	0.1251
1993-10-01	0.1183
1994-01-01	0.0110
1994-04-01	0.0110
1994-07-01	0.0110
1994-10-01	0.0110
1995-01-01	0.0110
1995-04-01	0.0110
1995-07-01	0.0110
1995-10-01	0.0110
1996-01-01	0.0110
1996-04-01	0.0110
1996-07-01	3.2330
1996-10-01	3.2330
1997-01-01	3.7330
1997-04-01	3.7330
1997-07-01	4.5480
1997-10-01	4.5480
1998-01-01	4.5480
1998-04-01	4.8480
1998-07-01	4.8480
1998-10-01	4.2347
1999-01-01	4.7347
1999-04-01	4.7347
1999-07-01	4.7347
1999-10-01	4.7347
2000-01-01	4.7347
2000-04-01	4.7089
2000-07-01	5.0589
2000-10-01	5.0589
2001-01-01	6.0739
2001-04-01	5.9180
2001-07-01	5.8947
2001-10-01	5.5311
2002-01-01	5.1814
2002-04-01	5.2189
2002-07-01	5.3118
2002-10-01	5.3594
2003-01-01	5.5397
2003-04-01	5.5536
2003-07-01	5.5136
2003-10-01	5.5429
2004-01-01	5.7094
2004-04-01	5.6829
2004-07-01	5.6815
2004-10-01	6.3179
2005-01-01	6.2982
2005-04-01	6.2720
2005-07-01	6.6705
2005-10-01	7.7740
2006-01-01	8.7834
2006-04-01	8.1730
2006-07-01	8.1269
2006-10-01	8.1269
2007-01-01	8.1269
2007-04-01	8.5769
2007-07-01	8.5769
2007-10-01	8.8969
2008-01-01	8.8969
2008-04-01	8.5668
2008-07-01	8.5668
2008-10-01	8.5668
2009-01-01	8.8898
2009-04-01	8.8898
2009-07-01	8.8898
2009-10-01	9.8898
2010-01-01	9.8898
2010-04-01	9.8898
2010-07-01	9.8898
2010-10-01	9.7398
2011-01-01	9.8167
2011-04-01	9.8316
2011-07-01	10.5740
2011-10-01	10.5664
2012-01-01	10.3877
2012-04-01	10.4058
2012-07-01	10.1375
2012-10-01	11.5820
2013-01-01	11.5433
2013-04-01	12.2753
2013-07-01	12.3770
2013-10-01	12.6766
2014-01-01	12.6860
2014-04-01	13.0628
2014-07-01	14.2564
2014-10-01	14.3901
2015-01-01	14.3012
2015-04-01	14.4600