Quarter	Billions of US Dollars
1966-04-01	0.010
1966-07-01	0.010
1966-10-01	0.010
1967-01-01	0.010
1967-04-01	0.035
1967-07-01	0.035
1967-10-01	0.035
1968-01-01	0.035
1968-04-01	0.035
1968-07-01	0.035
1968-10-01	0.035
1969-01-01	0.035
1969-04-01	0.035
1969-07-01	0.035
1969-10-01	0.035
1970-01-01	0.035
1970-04-01	0.035
1970-07-01	0.035
1970-10-01	0.035
1971-01-01	0.050
1971-04-01	0.050
1971-07-01	0.050
1971-10-01	0.062
1972-01-01	0.120
1972-04-01	0.165
1972-07-01	0.265
1972-10-01	0.393
1973-01-01	0.459
1973-04-01	0.539
1973-07-01	0.577
1973-10-01	0.582
1974-01-01	0.619
1974-04-01	0.622
1974-07-01	0.614
1974-10-01	0.690
1975-01-01	0.725
1975-04-01	0.776
1975-07-01	0.744
1975-10-01	0.881
1976-01-01	1.024
1976-04-01	1.116
1976-07-01	1.430
1976-10-01	1.694
1977-01-01	1.953
1977-04-01	2.164
1977-07-01	2.385
1977-10-01	2.816
1978-01-01	3.189
1978-04-01	3.358
1978-07-01	4.045
1978-10-01	4.168
1979-01-01	4.224
1979-04-01	4.363
1979-07-01	5.018
1979-10-01	5.019
1980-01-01	4.717
1980-04-01	5.570
1980-07-01	5.841
1980-10-01	5.683
1981-01-01	5.548
1981-04-01	5.357
1981-07-01	5.760
1981-10-01	6.213
1982-01-01	6.089
1982-04-01	6.108
1982-07-01	5.874
1982-10-01	6.450
1983-01-01	6.422
1983-04-01	6.605
1983-07-01	6.763
1983-10-01	7.503
1984-01-01	8.754
1984-04-01	8.835
1984-07-01	9.663
1984-10-01	10.285
1985-01-01	10.615
1985-04-01	11.690
1985-07-01	11.901
1985-10-01	12.403
1986-01-01	12.914
1986-04-01	14.363
1986-07-01	18.149
1986-10-01	20.070
1987-01-01	23.915
1987-04-01	24.093
1987-07-01	24.215
1987-10-01	26.791
1988-01-01	26.516
1988-04-01	26.306
1988-07-01	25.757
1988-10-01	26.295
1989-01-01	25.497
1989-04-01	25.202
1989-07-01	26.193
1989-10-01	27.766
1990-01-01	29.238
1990-04-01	29.188
1990-07-01	31.663
1990-10-01	32.058
1991-01-01	28.909
1991-04-01	27.966
1991-07-01	28.195
1991-10-01	27.536
1992-01-01	23.445
1992-04-01	24.057
1992-07-01	24.983
1992-10-01	22.917
1993-01-01	24.410
1993-04-01	25.388
1993-07-01	30.153
1993-10-01	30.516
1994-01-01	31.152
1994-04-01	30.629
1994-07-01	31.186
1994-10-01	30.724
1995-01-01	30.668
1995-04-01	30.952
1995-07-01	30.903
1995-10-01	30.121
1996-01-01	29.830
1996-04-01	29.657
1996-07-01	29.531
1996-10-01	29.366
1997-01-01	28.494
1997-04-01	30.181
1997-07-01	29.472
1997-10-01	28.433
1998-01-01	26.978
1998-04-01	27.218
1998-07-01	27.200
1998-10-01	28.176
1999-01-01	27.027
1999-04-01	26.598
1999-07-01	29.070
1999-10-01	27.937
2000-01-01	27.995
2000-04-01	28.326
2000-07-01	27.296
2000-10-01	28.213
2001-01-01	27.916
2001-04-01	29.715
2001-07-01	30.480
2001-10-01	29.731
2002-01-01	29.641
2002-04-01	32.246
2002-07-01	32.341
2002-10-01	33.062
2003-01-01	35.839
2003-04-01	39.964
2003-07-01	42.253
2003-10-01	44.428
2004-01-01	44.484
2004-04-01	46.314
2004-07-01	47.359
2004-10-01	52.238
2005-01-01	58.193
2005-04-01	60.831
2005-07-01	61.867
2005-10-01	65.121
2006-01-01	69.252
2006-04-01	75.963
2006-07-01	76.770
2006-10-01	83.450
2007-01-01	89.954
2007-04-01	96.775
2007-07-01	98.777
2007-10-01	102.597
2008-01-01	106.958
2008-04-01	112.843
2008-07-01	108.409
2008-10-01	100.699
2009-01-01	110.229
2009-04-01	129.458
2009-07-01	138.834
2009-10-01	141.647
2010-01-01	135.638
2010-04-01	131.238
2010-07-01	132.232
2010-10-01	130.043
2011-01-01	149.679
2011-04-01	152.309
2011-07-01	148.840
2011-10-01	135.907
2012-01-01	141.963
2012-04-01	129.063
2012-07-01	136.408
2012-10-01	140.900
2013-01-01	133.167
2013-04-01	130.323
2013-07-01	132.904
2013-10-01	136.295
2014-01-01	133.754
2014-04-01	130.119
2014-07-01	122.727
2014-10-01	120.046
2015-01-01	116.258
2015-04-01	117.304