Quarter	Billions of US Dollars
1974-10-01	0.019
1975-01-01	0.019
1975-04-01	0.019
1975-07-01	0.019
1975-10-01	0.019
1976-01-01	0.019
1976-04-01	0.029
1976-07-01	0.053
1976-10-01	0.093
1977-01-01	0.119
1977-04-01	0.119
1977-07-01	0.119
1977-10-01	0.167
1978-01-01	0.215
1978-04-01	0.232
1978-07-01	0.240
1978-10-01	0.242
1979-01-01	0.280
1979-04-01	0.279
1979-07-01	0.256
1979-10-01	0.254
1980-01-01	0.246
1980-04-01	0.259
1980-07-01	0.259
1980-10-01	0.306
1981-01-01	0.298
1981-04-01	0.284
1981-07-01	0.386
1981-10-01	0.353
1982-01-01	0.351
1982-04-01	0.345
1982-07-01	0.334
1982-10-01	0.359
1983-01-01	0.354
1983-04-01	0.358
1983-07-01	0.431
1983-10-01	0.505
1984-01-01	0.560
1984-04-01	0.655
1984-07-01	0.829
1984-10-01	1.169
1985-01-01	1.274
1985-04-01	1.767
1985-07-01	2.259
1985-10-01	2.800
1986-01-01	3.367
1986-04-01	3.722
1986-07-01	3.886
1986-10-01	3.969
1987-01-01	4.152
1987-04-01	4.155
1987-07-01	4.368
1987-10-01	4.886
1988-01-01	4.389
1988-04-01	4.107
1988-07-01	4.100
1988-10-01	4.340
1989-01-01	4.078
1989-04-01	3.797
1989-07-01	3.848
1989-10-01	3.953
1990-01-01	4.044
1990-04-01	3.888
1990-07-01	4.181
1990-10-01	4.115
1991-01-01	4.590
1991-04-01	5.882
1991-07-01	6.271
1991-10-01	6.991
1992-01-01	7.499
1992-04-01	7.960
1992-07-01	9.144
1992-10-01	9.678
1993-01-01	10.431
1993-04-01	11.409
1993-07-01	12.100
1993-10-01	14.284
1994-01-01	15.331
1994-04-01	16.932
1994-07-01	18.356
1994-10-01	18.620
1995-01-01	21.031
1995-04-01	23.549
1995-07-01	23.786
1995-10-01	24.503
1996-01-01	26.590
1996-04-01	29.674
1996-07-01	33.400
1996-10-01	36.871
1997-01-01	38.989
1997-04-01	42.524
1997-07-01	46.886
1997-10-01	48.062
1998-01-01	47.042
1998-04-01	49.842
1998-07-01	49.456
1998-10-01	49.682
1999-01-01	48.205
1999-04-01	46.888
1999-07-01	46.358
1999-10-01	46.709
2000-01-01	47.787
2000-04-01	47.319
2000-07-01	45.826
2000-10-01	45.640
2001-01-01	44.128
2001-04-01	43.867
2001-07-01	42.706
2001-10-01	43.994
2002-01-01	42.449
2002-04-01	44.295
2002-07-01	45.356
2002-10-01	46.226
2003-01-01	47.065
2003-04-01	49.942
2003-07-01	52.843
2003-10-01	52.967
2004-01-01	56.830
2004-04-01	60.050
2004-07-01	61.493
2004-10-01	64.195
2005-01-01	66.208
2005-04-01	66.856
2005-07-01	69.150
2005-10-01	72.655
2006-01-01	74.448
2006-04-01	78.687
2006-07-01	82.215
2006-10-01	85.829
2007-01-01	86.203
2007-04-01	95.896
2007-07-01	97.014
2007-10-01	98.943
2008-01-01	101.737
2008-04-01	103.257
2008-07-01	99.867
2008-10-01	99.042
2009-01-01	100.449
2009-04-01	110.456
2009-07-01	117.183
2009-10-01	115.239
2010-01-01	115.956
2010-04-01	116.433
2010-07-01	123.018
2010-10-01	126.749
2011-01-01	132.740
2011-04-01	136.752
2011-07-01	139.244
2011-10-01	141.558
2012-01-01	147.667
2012-04-01	147.575
2012-07-01	156.663
2012-10-01	153.519
2013-01-01	156.020
2013-04-01	149.437
2013-07-01	160.990
2013-10-01	169.140
2014-01-01	172.493
2014-04-01	172.380
2014-07-01	169.196
2014-10-01	172.672
2015-01-01	168.747
2015-04-01	172.062