Quarter	Billions of US Dollars
1966-01-01	0.0056
1966-04-01	0.0056
1966-07-01	0.0056
1966-10-01	0.0056
1967-01-01	0.0056
1967-04-01	0.0056
1967-07-01	0.0056
1967-10-01	0.0048
1968-01-01	0.0048
1968-04-01	0.0095
1968-07-01	0.0096
1968-10-01	0.0095
1969-01-01	0.0096
1969-04-01	0.0096
1969-07-01	0.0095
1969-10-01	0.0096
1970-01-01	0.0096
1970-04-01	0.0096
1970-07-01	0.0096
1970-10-01	0.0096
1971-01-01	0.0197
1971-04-01	0.0197
1971-07-01	0.0199
1971-10-01	0.0202
1972-01-01	0.0355
1972-04-01	0.0414
1972-07-01	0.0413
1972-10-01	0.0510
1973-01-01	0.0526
1973-04-01	0.0538
1973-07-01	0.0583
1973-10-01	0.0568
1974-01-01	0.0580
1974-04-01	0.0672
1974-07-01	0.0669
1974-10-01	0.0688
1975-01-01	0.0693
1975-04-01	0.0684
1975-07-01	0.0728
1975-10-01	0.0868
1976-01-01	0.0868
1976-04-01	0.0864
1976-07-01	0.0865
1976-10-01	0.0955
1977-01-01	0.1359
1977-04-01	0.1519
1977-07-01	0.1648
1977-10-01	0.1892
1978-01-01	0.2158
1978-04-01	0.2169
1978-07-01	0.2340
1978-10-01	0.2340
1979-01-01	0.2393
1979-04-01	0.2400
1979-07-01	0.3177
1979-10-01	0.3168
1980-01-01	0.2973
1980-04-01	0.3175
1980-07-01	0.3144
1980-10-01	0.3158
1981-01-01	0.3352
1981-04-01	0.3201
1981-07-01	0.3199
1981-10-01	0.3213
1982-01-01	0.3208
1982-04-01	0.3615
1982-07-01	0.3418
1982-10-01	0.3416
1983-01-01	0.3895
1983-04-01	0.4091
1983-07-01	0.4051
1983-10-01	0.4176
1984-01-01	0.4361
1984-04-01	0.4075
1984-07-01	0.3935
1984-10-01	0.3790
1985-01-01	0.3828
1985-04-01	0.4034
1985-07-01	0.5927
1985-10-01	0.7200
1986-01-01	0.7862
1986-04-01	0.9034
1986-07-01	1.0549
1986-10-01	1.1122
1987-01-01	1.2244
1987-04-01	1.2615
1987-07-01	1.2969
1987-10-01	1.4826
1988-01-01	1.4483
1988-04-01	1.4973
1988-07-01	1.4948
1988-10-01	1.6376
1989-01-01	1.7618
1989-04-01	1.7983
1989-07-01	1.8555
1989-10-01	2.0996
1990-01-01	2.0802
1990-04-01	2.2832
1990-07-01	2.3721
1990-10-01	2.5839
1991-01-01	2.3165
1991-04-01	2.3373
1991-07-01	2.5275
1991-10-01	2.7176
1992-01-01	2.9085
1992-04-01	3.1283
1992-07-01	3.4460
1992-10-01	3.0363
1993-01-01	3.1887
1993-04-01	3.3420
1993-07-01	3.7995
1993-10-01	3.7700
1994-01-01	4.1034
1994-04-01	4.2119
1994-07-01	4.4330
1994-10-01	4.4578
1995-01-01	4.9972
1995-04-01	4.9998
1995-07-01	4.9104
1995-10-01	4.7756
1996-01-01	4.6805
1996-04-01	5.0754
1996-07-01	5.0817
1996-10-01	4.8100
1997-01-01	4.3427
1997-04-01	4.4353
1997-07-01	4.4318
1997-10-01	4.4684
1998-01-01	4.4123
1998-04-01	4.8506
1998-07-01	4.8612
1998-10-01	5.5667
1999-01-01	5.6459
1999-04-01	5.7157
1999-07-01	5.9896
1999-10-01	6.1144
2000-01-01	6.6397
2000-04-01	6.9499
2000-07-01	6.6788
2000-10-01	7.6937
2001-01-01	8.4337
2001-04-01	8.5742
2001-07-01	8.8743
2001-10-01	8.9900
2002-01-01	9.0847
2002-04-01	10.3536
2002-07-01	10.0254
2002-10-01	9.9822
2003-01-01	10.2102
2003-04-01	11.3936
2003-07-01	12.8664
2003-10-01	15.1773
2004-01-01	16.1903
2004-04-01	17.2501
2004-07-01	22.0891
2004-10-01	27.1343
2005-01-01	29.9367
2005-04-01	32.5671
2005-07-01	36.0678
2005-10-01	39.5967
2006-01-01	42.4482
2006-04-01	45.2257
2006-07-01	47.3932
2006-10-01	54.8783
2007-01-01	58.4893
2007-04-01	60.1297
2007-07-01	61.8891
2007-10-01	63.7724
2008-01-01	66.4282
2008-04-01	67.7251
2008-07-01	61.3059
2008-10-01	57.5816
2009-01-01	52.8970
2009-04-01	52.6388
2009-07-01	52.6338
2009-10-01	49.3824
2010-01-01	44.9285
2010-04-01	42.2249
2010-07-01	44.7416
2010-10-01	41.4553
2011-01-01	42.0901
2011-04-01	43.1822
2011-07-01	39.4676
2011-10-01	34.9349
2012-01-01	32.6546
2012-04-01	30.5372
2012-07-01	26.9581
2012-10-01	24.8719
2013-01-01	22.2157
2013-04-01	20.8013
2013-07-01	21.0335
2013-10-01	21.0650
2014-01-01	20.9610
2014-04-01	20.5465
2014-07-01	20.5385
2014-10-01	19.7325
2015-01-01	18.6040
2015-04-01	17.7742