Quarter	Billions of US Dollars
1972-01-01	0.0200
1972-04-01	0.0595
1972-07-01	0.0595
1972-10-01	0.0595
1973-01-01	0.0620
1973-04-01	0.0644
1973-07-01	0.0635
1973-10-01	0.0612
1974-01-01	0.0606
1974-04-01	0.0607
1974-07-01	0.0701
1974-10-01	0.0715
1975-01-01	0.0727
1975-04-01	0.0738
1975-07-01	0.0710
1975-10-01	0.0713
1976-01-01	0.0704
1976-04-01	0.0701
1976-07-01	0.0693
1976-10-01	0.0831
1977-01-01	0.0830
1977-04-01	0.0852
1977-07-01	0.1103
1977-10-01	0.1115
1978-01-01	0.2055
1978-04-01	0.2098
1978-07-01	0.2850
1978-10-01	0.3265
1979-01-01	0.3988
1979-04-01	0.3951
1979-07-01	0.5083
1979-10-01	0.5026
1980-01-01	0.4958
1980-04-01	0.6127
1980-07-01	0.6396
1980-10-01	0.6418
1981-01-01	0.6351
1981-04-01	0.6242
1981-07-01	0.6214
1981-10-01	0.6267
1982-01-01	0.5997
1982-04-01	0.5955
1982-07-01	0.5645
1982-10-01	0.5776
1983-01-01	0.5652
1983-04-01	0.6643
1983-07-01	0.6657
1983-10-01	0.6669
1984-01-01	0.6513
1984-04-01	0.6438
1984-07-01	0.6385
1984-10-01	0.7351
1985-01-01	0.7349
1985-04-01	0.7365
1985-07-01	0.7923
1985-10-01	0.7070
1986-01-01	0.7086
1986-04-01	0.7276
1986-07-01	0.7499
1986-10-01	0.7697
1987-01-01	0.9006
1987-04-01	1.0174
1987-07-01	0.9905
1987-10-01	1.0620
1988-01-01	0.9558
1988-04-01	0.9363
1988-07-01	0.9250
1988-10-01	0.9577
1989-01-01	0.9312
1989-04-01	0.8457
1989-07-01	0.7901
1989-10-01	0.8100
1990-01-01	0.7962
1990-04-01	0.8060
1990-07-01	0.7499
1990-10-01	0.6186
1991-01-01	0.5868
1991-04-01	0.5797
1991-07-01	0.6023
1991-10-01	0.6237
1992-01-01	0.4981
1992-04-01	0.4429
1992-07-01	0.4665
1992-10-01	0.4331
1993-01-01	0.4000
1993-04-01	0.4011
1993-07-01	0.4103
1993-10-01	0.3052
1994-01-01	0.2007
1994-04-01	0.2050
1994-07-01	0.2079
1994-10-01	0.2078
1995-01-01	0.2194
1995-04-01	0.2194
1995-07-01	0.2167
1995-10-01	0.1310
1996-01-01	0.1110
1996-04-01	0.1110
1996-07-01	3.4080
1996-10-01	3.4080
1997-01-01	3.8080
1997-04-01	3.8080
1997-07-01	4.6230
1997-10-01	4.7540
1998-01-01	4.7540
1998-04-01	5.0540
1998-07-01	4.9790
1998-10-01	4.3657
1999-01-01	4.8657
1999-04-01	4.8610
1999-07-01	4.8610
1999-10-01	4.8563
2000-01-01	4.8563
2000-04-01	4.8259
2000-07-01	5.1759
2000-10-01	5.1712
2001-01-01	6.1861
2001-04-01	6.0256
2001-07-01	6.0023
2001-10-01	5.6340
2002-01-01	5.2843
2002-04-01	5.3172
2002-07-01	5.4101
2002-10-01	5.4530
2003-01-01	5.6333
2003-04-01	5.6425
2003-07-01	5.6024
2003-10-01	5.6271
2004-01-01	5.7936
2004-04-01	5.7624
2004-07-01	5.7610
2004-10-01	6.3927
2005-01-01	6.3730
2005-04-01	6.3422
2005-07-01	6.7407
2005-10-01	7.8395
2006-01-01	9.1489
2006-04-01	8.5385
2006-07-01	8.5924
2006-10-01	8.8830
2007-01-01	8.8830
2007-04-01	9.3284
2007-07-01	9.3284
2007-10-01	9.8050
2008-01-01	9.8198
2008-04-01	9.4368
2008-07-01	9.4363
2008-10-01	9.4231
2009-01-01	9.7451
2009-04-01	9.7481
2009-07-01	9.7551
2009-10-01	10.7548
2010-01-01	10.7576
2010-04-01	10.7640
2010-07-01	10.7664
2010-10-01	10.6109
2011-01-01	10.6881
2011-04-01	10.6979
2011-07-01	11.6399
2011-10-01	12.0499
2012-01-01	11.8683
2012-04-01	12.2233
2012-07-01	11.9543
2012-10-01	12.9874
2013-01-01	13.2586
2013-04-01	14.4542
2013-07-01	14.5605
2013-10-01	14.8620
2014-01-01	15.0672
2014-04-01	16.4823
2014-07-01	17.6675
2014-10-01	17.3987
2015-01-01	17.3012
2015-04-01	17.7900