Quarter	Billions of US Dollars
1972-07-01	0.016
1972-10-01	0.016
1973-01-01	0.048
1973-04-01	0.074
1973-07-01	0.091
1973-10-01	0.084
1974-01-01	0.088
1974-04-01	0.088
1974-07-01	0.086
1974-10-01	0.091
1975-01-01	0.094
1975-04-01	0.093
1975-07-01	0.086
1975-10-01	0.087
1976-01-01	0.087
1976-04-01	0.086
1976-07-01	0.090
1976-10-01	0.150
1977-01-01	0.294
1977-04-01	0.481
1977-07-01	0.502
1977-10-01	0.539
1978-01-01	0.562
1978-04-01	0.560
1978-07-01	0.785
1978-10-01	0.772
1979-01-01	0.749
1979-04-01	0.758
1979-07-01	0.904
1979-10-01	0.898
1980-01-01	0.795
1980-04-01	0.923
1980-07-01	0.903
1980-10-01	0.867
1981-01-01	0.830
1981-04-01	0.781
1981-07-01	0.799
1981-10-01	0.885
1982-01-01	0.946
1982-04-01	0.899
1982-07-01	0.882
1982-10-01	1.000
1983-01-01	0.978
1983-04-01	0.976
1983-07-01	0.909
1983-10-01	0.952
1984-01-01	0.829
1984-04-01	0.910
1984-07-01	0.889
1984-10-01	0.907
1985-01-01	0.908
1985-04-01	0.904
1985-07-01	0.948
1985-10-01	1.024
1986-01-01	1.058
1986-04-01	1.101
1986-07-01	1.094
1986-10-01	1.118
1987-01-01	1.153
1987-04-01	1.013
1987-07-01	0.996
1987-10-01	1.106
1988-01-01	1.025
1988-04-01	0.954
1988-07-01	0.868
1988-10-01	0.705
1989-01-01	0.644
1989-04-01	0.631
1989-07-01	0.639
1989-10-01	0.884
1990-01-01	0.886
1990-04-01	0.910
1990-07-01	0.947
1990-10-01	0.977
1991-01-01	1.702
1991-04-01	1.634
1991-07-01	1.335
1991-10-01	1.267
1992-01-01	1.272
1992-04-01	1.344
1992-07-01	1.462
1992-10-01	1.602
1993-01-01	1.738
1993-04-01	1.881
1993-07-01	2.054
1993-10-01	2.001
1994-01-01	2.051
1994-04-01	2.304
1994-07-01	2.464
1994-10-01	2.676
1995-01-01	3.854
1995-04-01	3.996
1995-07-01	4.117
1995-10-01	4.454
1996-01-01	4.542
1996-04-01	5.912
1996-07-01	6.538
1996-10-01	6.806
1997-01-01	6.483
1997-04-01	6.487
1997-07-01	6.690
1997-10-01	7.170
1998-01-01	7.158
1998-04-01	7.066
1998-07-01	7.250
1998-10-01	7.073
1999-01-01	6.900
1999-04-01	6.835
1999-07-01	6.910
1999-10-01	7.061
2000-01-01	7.318
2000-04-01	8.229
2000-07-01	8.053
2000-10-01	10.104
2001-01-01	10.867
2001-04-01	11.719
2001-07-01	14.588
2001-10-01	17.979
2002-01-01	19.192
2002-04-01	25.150
2002-07-01	25.700
2002-10-01	29.535
2003-01-01	31.379
2003-04-01	33.197
2003-07-01	36.411
2003-10-01	44.553
2004-01-01	44.868
2004-04-01	48.509
2004-07-01	49.722
2004-10-01	56.520
2005-01-01	56.033
2005-04-01	55.817
2005-07-01	59.603
2005-10-01	63.190
2006-01-01	67.193
2006-04-01	73.897
2006-07-01	82.579
2006-10-01	86.398
2007-01-01	81.710
2007-04-01	80.994
2007-07-01	85.905
2007-10-01	87.310
2008-01-01	93.058
2008-04-01	95.842
2008-07-01	88.190
2008-10-01	90.870
2009-01-01	82.989
2009-04-01	91.208
2009-07-01	92.149
2009-10-01	90.255
2010-01-01	84.204
2010-04-01	77.724
2010-07-01	85.061
2010-10-01	83.587
2011-01-01	89.400
2011-04-01	89.996
2011-07-01	84.043
2011-10-01	83.120
2012-01-01	88.175
2012-04-01	82.564
2012-07-01	80.350
2012-10-01	79.453
2013-01-01	82.667
2013-04-01	91.562
2013-07-01	97.483
2013-10-01	102.608
2014-01-01	111.254
2014-04-01	111.762
2014-07-01	111.456
2014-10-01	111.495
2015-01-01	110.179
2015-04-01	124.432