Quarter	Billions of US Dollars
1972-04-01	0.0254
1972-07-01	0.0250
1972-10-01	0.0250
1973-01-01	0.0582
1973-04-01	0.0821
1973-07-01	0.0828
1973-10-01	0.0773
1974-01-01	0.0803
1974-04-01	0.0802
1974-07-01	0.0787
1974-10-01	0.0832
1975-01-01	0.0850
1975-04-01	0.0845
1975-07-01	0.0783
1975-10-01	0.0791
1976-01-01	0.0801
1976-04-01	0.0828
1976-07-01	0.0926
1976-10-01	0.0947
1977-01-01	0.0940
1977-04-01	0.0949
1977-07-01	0.1388
1977-10-01	0.1482
1978-01-01	0.1530
1978-04-01	0.2233
1978-07-01	0.2369
1978-10-01	0.2914
1979-01-01	0.3827
1979-04-01	0.3793
1979-07-01	0.4372
1979-10-01	0.4276
1980-01-01	0.3945
1980-04-01	0.4103
1980-07-01	0.4089
1980-10-01	0.4015
1981-01-01	0.3823
1981-04-01	0.3540
1981-07-01	0.3546
1981-10-01	0.3723
1982-01-01	0.6568
1982-04-01	0.6834
1982-07-01	0.6689
1982-10-01	1.0044
1983-01-01	1.0585
1983-04-01	1.2649
1983-07-01	2.1109
1983-10-01	2.2134
1984-01-01	2.5525
1984-04-01	2.5130
1984-07-01	2.6291
1984-10-01	3.2043
1985-01-01	3.2057
1985-04-01	4.0697
1985-07-01	4.2349
1985-10-01	5.3932
1986-01-01	5.5356
1986-04-01	5.6675
1986-07-01	5.8091
1986-10-01	5.8595
1987-01-01	6.0439
1987-04-01	6.1038
1987-07-01	6.1857
1987-10-01	6.5921
1988-01-01	6.7016
1988-04-01	6.1629
1988-07-01	6.1506
1988-10-01	6.3092
1989-01-01	6.2757
1989-04-01	5.8650
1989-07-01	5.8544
1989-10-01	6.0774
1990-01-01	5.9948
1990-04-01	6.0590
1990-07-01	6.4822
1990-10-01	6.4185
1991-01-01	6.1717
1991-04-01	6.3349
1991-07-01	6.4880
1991-10-01	6.6814
1992-01-01	6.3748
1992-04-01	6.4951
1992-07-01	6.6636
1992-10-01	5.3569
1993-01-01	5.4253
1993-04-01	5.5110
1993-07-01	4.8563
1993-10-01	4.8933
1994-01-01	5.0414
1994-04-01	5.2287
1994-07-01	5.0476
1994-10-01	5.1827
1995-01-01	5.4049
1995-04-01	4.9892
1995-07-01	6.3588
1995-10-01	6.6556
1996-01-01	6.9355
1996-04-01	7.1943
1996-07-01	7.2923
1996-10-01	9.1923
1997-01-01	9.4713
1997-04-01	11.6911
1997-07-01	12.2423
1997-10-01	12.4846
1998-01-01	11.9543
1998-04-01	11.8654
1998-07-01	11.7682
1998-10-01	12.0247
1999-01-01	12.8066
1999-04-01	13.6536
1999-07-01	14.5997
1999-10-01	14.6195
2000-01-01	14.3881
2000-04-01	14.4638
2000-07-01	14.6822
2000-10-01	15.5723
2001-01-01	15.4933
2001-04-01	16.1125
2001-07-01	17.3654
2001-10-01	17.1759
2002-01-01	18.3157
2002-04-01	21.1931
2002-07-01	21.5690
2002-10-01	22.8391
2003-01-01	22.7934
2003-04-01	22.9469
2003-07-01	22.3393
2003-10-01	22.8984
2004-01-01	24.6095
2004-04-01	24.6312
2004-07-01	26.3650
2004-10-01	28.3874
2005-01-01	28.1485
2005-04-01	29.1170
2005-07-01	29.4971
2005-10-01	28.4740
2006-01-01	29.7384
2006-04-01	30.0742
2006-07-01	30.6805
2006-10-01	31.4426
2007-01-01	31.7539
2007-04-01	31.1505
2007-07-01	31.5468
2007-10-01	31.8159
2008-01-01	33.2316
2008-04-01	32.7371
2008-07-01	32.9570
2008-10-01	32.3265
2009-01-01	31.2131
2009-04-01	29.2304
2009-07-01	33.8258
2009-10-01	32.7502
2010-01-01	33.5183
2010-04-01	35.5739
2010-07-01	38.5792
2010-10-01	39.4554
2011-01-01	39.5278
2011-04-01	40.3693
2011-07-01	41.0085
2011-10-01	40.9574
2012-01-01	44.6564
2012-04-01	48.2807
2012-07-01	51.0765
2012-10-01	49.9376
2013-01-01	49.0810
2013-04-01	51.9734
2013-07-01	52.1057
2013-10-01	53.6812
2014-01-01	54.3924
2014-04-01	55.3846
2014-07-01	53.6174
2014-10-01	55.1422
2015-01-01	59.0297
2015-04-01	60.0765