Quarter	Billions of US Dollars
1972-07-01	0.050
1972-10-01	0.050
1973-01-01	0.050
1973-04-01	0.080
1973-07-01	0.080
1973-10-01	0.080
1974-01-01	0.080
1974-04-01	0.131
1974-07-01	0.131
1974-10-01	0.132
1975-01-01	0.193
1975-04-01	0.275
1975-07-01	0.268
1975-10-01	0.288
1976-01-01	0.332
1976-04-01	0.401
1976-07-01	0.422
1976-10-01	0.460
1977-01-01	0.529
1977-04-01	0.550
1977-07-01	0.702
1977-10-01	0.825
1978-01-01	0.834
1978-04-01	0.911
1978-07-01	0.929
1978-10-01	0.935
1979-01-01	0.925
1979-04-01	1.047
1979-07-01	1.113
1979-10-01	1.109
1980-01-01	1.053
1980-04-01	1.143
1980-07-01	1.152
1980-10-01	1.138
1981-01-01	1.087
1981-04-01	0.938
1981-07-01	0.939
1981-10-01	0.919
1982-01-01	0.897
1982-04-01	0.887
1982-07-01	0.843
1982-10-01	0.843
1983-01-01	0.776
1983-04-01	0.713
1983-07-01	0.677
1983-10-01	0.658
1984-01-01	0.664
1984-04-01	0.582
1984-07-01	0.596
1984-10-01	0.590
1985-01-01	0.762
1985-04-01	0.743
1985-07-01	0.942
1985-10-01	0.893
1986-01-01	1.109
1986-04-01	1.534
1986-07-01	1.656
1986-10-01	1.740
1987-01-01	2.223
1987-04-01	2.177
1987-07-01	2.173
1987-10-01	2.842
1988-01-01	3.561
1988-04-01	3.794
1988-07-01	4.254
1988-10-01	5.141
1989-01-01	5.788
1989-04-01	5.827
1989-07-01	7.328
1989-10-01	8.148
1990-01-01	8.738
1990-04-01	9.133
1990-07-01	10.182
1990-10-01	11.186
1991-01-01	10.372
1991-04-01	10.421
1991-07-01	11.239
1991-10-01	13.507
1992-01-01	13.517
1992-04-01	14.567
1992-07-01	16.706
1992-10-01	16.252
1993-01-01	18.983
1993-04-01	20.512
1993-07-01	23.193
1993-10-01	24.168
1994-01-01	26.688
1994-04-01	27.982
1994-07-01	34.008
1994-10-01	40.248
1995-01-01	42.354
1995-04-01	43.466
1995-07-01	42.552
1995-10-01	42.381
1996-01-01	41.916
1996-04-01	43.055
1996-07-01	40.844
1996-10-01	40.337
1997-01-01	41.024
1997-04-01	46.246
1997-07-01	48.531
1997-10-01	47.986
1998-01-01	49.849
1998-04-01	55.204
1998-07-01	62.410
1998-10-01	62.041
1999-01-01	61.474
1999-04-01	61.210
1999-07-01	62.401
1999-10-01	64.488
2000-01-01	65.165
2000-04-01	68.476
2000-07-01	87.909
2000-10-01	88.002
2001-01-01	87.225
2001-04-01	86.632
2001-07-01	88.529
2001-10-01	88.002
2002-01-01	88.970
2002-04-01	93.777
2002-07-01	94.286
2002-10-01	97.606
2003-01-01	103.990
2003-04-01	106.010
2003-07-01	110.495
2003-10-01	115.311
2004-01-01	116.772
2004-04-01	122.685
2004-07-01	126.519
2004-10-01	134.836
2005-01-01	140.837
2005-04-01	147.474
2005-07-01	143.389
2005-10-01	146.944
2006-01-01	158.056
2006-04-01	160.993
2006-07-01	165.899
2006-10-01	180.415
2007-01-01	191.979
2007-04-01	198.268
2007-07-01	203.309
2007-10-01	209.648
2008-01-01	216.295
2008-04-01	229.189
2008-07-01	224.171
2008-10-01	220.088
2009-01-01	213.757
2009-04-01	227.144
2009-07-01	233.440
2009-10-01	238.968
2010-01-01	236.348
2010-04-01	235.263
2010-07-01	258.817
2010-10-01	261.520
2011-01-01	282.848
2011-04-01	298.054
2011-07-01	289.490
2011-10-01	284.311
2012-01-01	300.457
2012-04-01	314.313
2012-07-01	340.238
2012-10-01	376.383
2013-01-01	380.033
2013-04-01	400.540
2013-07-01	413.033
2013-10-01	442.203
2014-01-01	435.944
2014-04-01	440.678
2014-07-01	431.008
2014-10-01	430.432
2015-01-01	418.279
2015-04-01	422.235