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	0.893
1976-01-01	1.036
1976-04-01	1.128
1976-07-01	1.442
1976-10-01	1.697
1977-01-01	1.906
1977-04-01	2.116
1977-07-01	2.294
1977-10-01	2.720
1978-01-01	3.088
1978-04-01	3.258
1978-07-01	3.935
1978-10-01	4.058
1979-01-01	4.117
1979-04-01	4.255
1979-07-01	4.904
1979-10-01	4.906
1980-01-01	4.615
1980-04-01	5.458
1980-07-01	5.732
1980-10-01	5.551
1981-01-01	5.397
1981-04-01	5.209
1981-07-01	5.611
1981-10-01	6.064
1982-01-01	5.949
1982-04-01	5.974
1982-07-01	5.788
1982-10-01	6.362
1983-01-01	6.357
1983-04-01	6.540
1983-07-01	6.699
1983-10-01	7.444
1984-01-01	8.714
1984-04-01	8.798
1984-07-01	9.628
1984-10-01	10.128
1985-01-01	10.456
1985-04-01	11.448
1985-07-01	11.583
1985-10-01	11.982
1986-01-01	12.435
1986-04-01	13.828
1986-07-01	17.481
1986-10-01	19.414
1987-01-01	23.211
1987-04-01	23.339
1987-07-01	23.409
1987-10-01	25.823
1988-01-01	25.430
1988-04-01	25.164
1988-07-01	24.572
1988-10-01	24.985
1989-01-01	24.132
1989-04-01	23.411
1989-07-01	24.002
1989-10-01	25.450
1990-01-01	26.907
1990-04-01	26.686
1990-07-01	28.945
1990-10-01	29.033
1991-01-01	26.217
1991-04-01	25.374
1991-07-01	25.443
1991-10-01	24.655
1992-01-01	20.511
1992-04-01	21.025
1992-07-01	21.704
1992-10-01	20.005
1993-01-01	21.474
1993-04-01	22.452
1993-07-01	26.925
1993-10-01	27.322
1994-01-01	27.935
1994-04-01	27.608
1994-07-01	28.384
1994-10-01	27.934
1995-01-01	27.642
1995-04-01	27.948
1995-07-01	27.747
1995-10-01	27.052
1996-01-01	26.876
1996-04-01	26.261
1996-07-01	26.198
1996-10-01	26.302
1997-01-01	25.934
1997-04-01	27.283
1997-07-01	26.639
1997-10-01	25.561
1998-01-01	24.188
1998-04-01	23.646
1998-07-01	23.631
1998-10-01	24.233
1999-01-01	23.192
1999-04-01	22.650
1999-07-01	24.638
1999-10-01	23.495
2000-01-01	22.809
2000-04-01	23.320
2000-07-01	22.648
2000-10-01	23.050
2001-01-01	22.363
2001-04-01	24.592
2001-07-01	25.176
2001-10-01	24.604
2002-01-01	24.413
2002-04-01	26.578
2002-07-01	26.936
2002-10-01	27.418
2003-01-01	30.099
2003-04-01	34.003
2003-07-01	36.004
2003-10-01	37.845
2004-01-01	38.017
2004-04-01	39.443
2004-07-01	39.872
2004-10-01	44.999
2005-01-01	51.366
2005-04-01	53.258
2005-07-01	55.835
2005-10-01	58.782
2006-01-01	62.835
2006-04-01	69.449
2006-07-01	71.819
2006-10-01	77.313
2007-01-01	87.858
2007-04-01	109.504
2007-07-01	111.630
2007-10-01	116.783
2008-01-01	125.469
2008-04-01	132.574
2008-07-01	126.565
2008-10-01	118.488
2009-01-01	125.373
2009-04-01	144.866
2009-07-01	154.151
2009-10-01	156.205
2010-01-01	149.776
2010-04-01	142.070
2010-07-01	147.318
2010-10-01	146.467
2011-01-01	165.274
2011-04-01	169.372
2011-07-01	165.183
2011-10-01	152.906
2012-01-01	160.134
2012-04-01	146.171
2012-07-01	156.043
2012-10-01	162.968
2013-01-01	155.296
2013-04-01	154.619
2013-07-01	156.018
2013-10-01	159.910
2014-01-01	157.420
2014-04-01	153.971
2014-07-01	144.700
2014-10-01	141.491
2015-01-01	135.245
2015-04-01	137.502