Quarter	Billions of US Dollars
1975-04-01	0.104
1975-07-01	0.096
1975-10-01	0.097
1976-01-01	0.097
1976-04-01	0.096
1976-07-01	0.099
1976-10-01	0.164
1977-01-01	0.164
1977-04-01	0.165
1977-07-01	0.166
1977-10-01	0.172
1978-01-01	0.175
1978-04-01	0.174
1978-07-01	0.180
1978-10-01	0.184
1979-01-01	0.282
1979-04-01	0.283
1979-07-01	0.287
1979-10-01	0.288
1980-01-01	0.278
1980-04-01	0.521
1980-07-01	0.519
1980-10-01	0.715
1981-01-01	0.712
1981-04-01	0.706
1981-07-01	0.707
1981-10-01	0.708
1982-01-01	0.705
1982-04-01	0.705
1982-07-01	0.704
1982-10-01	0.706
1983-01-01	0.705
1983-04-01	0.664
1983-07-01	0.716
1983-10-01	0.716
1984-01-01	0.860
1984-04-01	0.851
1984-07-01	0.841
1984-10-01	0.832
1985-01-01	0.840
1985-04-01	0.846
1985-07-01	0.556
1985-10-01	0.322
1986-01-01	0.328
1986-04-01	0.334
1986-07-01	0.359
1986-10-01	0.356
1987-01-01	0.406
1987-04-01	0.405
1987-07-01	0.407
1987-10-01	0.609
1988-01-01	0.595
1988-04-01	0.553
1988-07-01	0.542
1988-10-01	0.568
1989-01-01	0.539
1989-04-01	0.364
1989-07-01	0.405
1989-10-01	0.429
1990-01-01	0.432
1990-04-01	0.439
1990-07-01	0.554
1990-10-01	0.566
1991-01-01	0.523
1991-04-01	0.506
1991-07-01	1.105
1991-10-01	1.133
1992-01-01	1.106
1992-04-01	1.130
1992-07-01	1.069
1992-10-01	1.054
1993-01-01	1.251
1993-04-01	1.241
1993-07-01	1.272
1993-10-01	1.312
1994-01-01	1.448
1994-04-01	1.660
1994-07-01	1.686
1994-10-01	1.477
1995-01-01	1.545
1995-04-01	1.622
1995-07-01	2.275
1995-10-01	2.518
1996-01-01	2.720
1996-04-01	3.317
1996-07-01	3.699
1996-10-01	3.900
1997-01-01	4.659
1997-04-01	4.800
1997-07-01	5.245
1997-10-01	5.161
1998-01-01	5.569
1998-04-01	7.829
1998-07-01	7.475
1998-10-01	7.474
1999-01-01	7.200
1999-04-01	7.106
1999-07-01	7.202
1999-10-01	6.903
2000-01-01	6.520
2000-04-01	6.385
2000-07-01	6.668
2000-10-01	6.617
2001-01-01	7.971
2001-04-01	7.713
2001-07-01	8.087
2001-10-01	9.348
2002-01-01	9.298
2002-04-01	9.621
2002-07-01	9.267
2002-10-01	9.134
2003-01-01	10.809
2003-04-01	12.962
2003-07-01	14.755
2003-10-01	20.462
2004-01-01	21.086
2004-04-01	21.233
2004-07-01	21.355
2004-10-01	22.924
2005-01-01	22.876
2005-04-01	21.782
2005-07-01	22.371
2005-10-01	22.570
2006-01-01	22.954
2006-04-01	23.024
2006-07-01	22.904
2006-10-01	24.762
2007-01-01	25.904
2007-04-01	27.642
2007-07-01	27.441
2007-10-01	30.948
2008-01-01	28.673
2008-04-01	29.704
2008-07-01	29.246
2008-10-01	29.150
2009-01-01	28.525
2009-04-01	28.072
2009-07-01	28.823
2009-10-01	28.522
2010-01-01	29.410
2010-04-01	28.158
2010-07-01	33.624
2010-10-01	35.101
2011-01-01	37.692
2011-04-01	41.764
2011-07-01	42.569
2011-10-01	41.694
2012-01-01	41.647
2012-04-01	50.263
2012-07-01	53.578
2012-10-01	57.222
2013-01-01	57.173
2013-04-01	67.136
2013-07-01	66.409
2013-10-01	76.192
2014-01-01	79.689
2014-04-01	93.002
2014-07-01	100.246
2014-10-01	109.964
2015-01-01	119.093
2015-04-01	143.034