Quarter	Billions of US Dollars
1975-01-01	24.304
1975-04-01	25.663
1975-07-01	23.077
1975-10-01	25.315
1976-01-01	26.917
1976-04-01	28.133
1976-07-01	30.865
1976-10-01	33.199
1977-01-01	34.744
1977-04-01	36.167
1977-07-01	36.568
1977-10-01	41.123
1978-01-01	40.860
1978-04-01	41.205
1978-07-01	44.490
1978-10-01	46.463
1979-01-01	46.222
1979-04-01	47.113
1979-07-01	49.047
1979-10-01	49.073
1980-01-01	47.844
1980-04-01	52.116
1980-07-01	54.118
1980-10-01	52.607
1981-01-01	52.099
1981-04-01	47.424
1981-07-01	49.677
1981-10-01	51.666
1982-01-01	51.549
1982-04-01	52.712
1982-07-01	49.760
1982-10-01	51.196
1983-01-01	52.087
1983-04-01	52.802
1983-07-01	53.562
1983-10-01	52.090
1984-01-01	55.939
1984-04-01	55.385
1984-07-01	52.607
1984-10-01	53.115
1985-01-01	56.027
1985-04-01	56.952
1985-07-01	64.145
1985-10-01	67.566
1986-01-01	71.571
1986-04-01	74.794
1986-07-01	76.900
1986-10-01	78.063
1987-01-01	86.600
1987-04-01	91.273
1987-07-01	95.086
1987-10-01	100.898
1988-01-01	104.681
1988-04-01	101.969
1988-07-01	99.117
1988-10-01	103.339
1989-01-01	104.569
1989-04-01	103.696
1989-07-01	108.095
1989-10-01	110.475
1990-01-01	115.500
1990-04-01	119.977
1990-07-01	125.018
1990-10-01	126.778
1991-01-01	114.582
1991-04-01	112.302
1991-07-01	118.554
1991-10-01	120.454
1992-01-01	123.022
1992-04-01	131.354
1992-07-01	136.670
1992-10-01	119.369
1993-01-01	121.722
1993-04-01	119.175
1993-07-01	117.138
1993-10-01	110.826
1994-01-01	115.356
1994-04-01	119.122
1994-07-01	121.502
1994-10-01	117.476
1995-01-01	131.585
1995-04-01	134.348
1995-07-01	132.469
1995-10-01	132.104
1996-01-01	133.599
1996-04-01	134.457
1996-07-01	135.782
1996-10-01	140.260
1997-01-01	143.091
1997-04-01	140.787
1997-07-01	149.115
1997-10-01	150.302
1998-01-01	151.764
1998-04-01	159.454
1998-07-01	166.942
1998-10-01	166.758
1999-01-01	167.898
1999-04-01	169.441
1999-07-01	171.183
1999-10-01	170.304
2000-01-01	168.419
2000-04-01	173.178
2000-07-01	174.571
2000-10-01	177.132
2001-01-01	175.531
2001-04-01	179.334
2001-07-01	185.061
2001-10-01	186.981
2002-01-01	196.303
2002-04-01	231.386
2002-07-01	233.136
2002-10-01	251.105
2003-01-01	248.689
2003-04-01	255.300
2003-07-01	259.862
2003-10-01	267.594
2004-01-01	270.856
2004-04-01	281.643
2004-07-01	299.336
2004-10-01	336.932
2005-01-01	328.745
2005-04-01	325.828
2005-07-01	330.777
2005-10-01	331.205
2006-01-01	352.289
2006-04-01	383.394
2006-07-01	380.353
2006-10-01	400.359
2007-01-01	435.547
2007-04-01	475.170
2007-07-01	520.597
2007-10-01	555.286
2008-01-01	633.296
2008-04-01	665.067
2008-07-01	611.749
2008-10-01	537.303
2009-01-01	563.565
2009-04-01	589.145
2009-07-01	626.284
2009-10-01	605.821
2010-01-01	592.698
2010-04-01	561.633
2010-07-01	628.695
2010-10-01	638.126
2011-01-01	686.786
2011-04-01	706.811
2011-07-01	654.295
2011-10-01	638.496
2012-01-01	735.463
2012-04-01	703.144
2012-07-01	739.357
2012-10-01	759.752
2013-01-01	720.554
2013-04-01	704.662
2013-07-01	705.184
2013-10-01	697.237
2014-01-01	713.435
2014-04-01	700.907
2014-07-01	673.132
2014-10-01	591.359
2015-01-01	561.314
2015-04-01	587.788
2015-07-01	555.086
2015-10-01	543.880
2016-01-01	576.806
2016-04-01	570.554
2016-07-01	591.683
2016-10-01	555.126
2017-01-01	558.642
2017-04-01	578.244
2017-07-01	599.855
2017-10-01	582.550
2018-01-01	608.067