Quarter	Billions of US Dollars
1971-01-01	9.207
1971-04-01	9.427
1971-07-01	9.897
1971-10-01	10.410
1972-01-01	10.710
1972-04-01	10.988
1972-07-01	11.269
1972-10-01	12.348
1973-01-01	14.633
1973-04-01	15.558
1973-07-01	17.241
1973-10-01	18.246
1974-01-01	19.563
1974-04-01	20.865
1974-07-01	19.565
1974-10-01	20.956
1975-01-01	22.194
1975-04-01	22.552
1975-07-01	22.135
1975-10-01	22.931
1976-01-01	23.727
1976-04-01	24.418
1976-07-01	25.405
1976-10-01	23.259
1977-01-01	24.010
1977-04-01	25.886
1977-07-01	26.559
1977-10-01	28.162
1978-01-01	28.904
1978-04-01	30.531
1978-07-01	31.271
1978-10-01	32.285
1979-01-01	32.135
1979-04-01	34.434
1979-07-01	36.111
1979-10-01	36.711
1980-01-01	37.061
1980-04-01	41.885
1980-07-01	43.164
1980-10-01	44.926
1981-01-01	45.749
1981-04-01	48.030
1981-07-01	49.747
1981-10-01	50.974
1982-01-01	49.579
1982-04-01	50.405
1982-07-01	48.155
1982-10-01	50.552
1983-01-01	47.254
1983-04-01	49.984
1983-07-01	52.101
1983-10-01	54.334
1984-01-01	58.874
1984-04-01	56.994
1984-07-01	57.771
1984-10-01	60.457
1985-01-01	53.573
1985-04-01	54.637
1985-07-01	60.773
1985-10-01	62.366
1986-01-01	67.593
1986-04-01	69.488
1986-07-01	69.421
1986-10-01	76.659
1987-01-01	84.975
1987-04-01	93.454
1987-07-01	97.735
1987-10-01	106.135
1988-01-01	115.858
1988-04-01	132.345
1988-07-01	138.992
1988-10-01	160.108
1989-01-01	158.945
1989-04-01	156.353
1989-07-01	166.181
1989-10-01	173.617
1990-01-01	171.654
1990-04-01	186.544
1990-07-01	198.974
1990-10-01	189.144
1991-01-01	190.138
1991-04-01	189.843
1991-07-01	198.734
1991-10-01	189.179
1992-01-01	190.948
1992-04-01	186.756
1992-07-01	183.860
1992-10-01	177.828
1993-01-01	185.867
1993-04-01	178.008
1993-07-01	174.194
1993-10-01	187.122
1994-01-01	198.005
1994-04-01	212.239
1994-07-01	218.180
1994-10-01	235.582
1995-01-01	223.964
1995-04-01	224.688
1995-07-01	248.285
1995-10-01	252.072
1996-01-01	270.789
1996-04-01	279.222
1996-07-01	287.191
1996-10-01	297.156
1997-01-01	294.022
1997-04-01	288.422
1997-07-01	286.966
1997-10-01	269.659
1998-01-01	279.151
1998-04-01	265.666
1998-07-01	262.007
1998-10-01	279.932
1999-01-01	292.401
1999-04-01	316.282
1999-07-01	317.011
1999-10-01	331.293
2000-01-01	314.124
2000-04-01	324.089
2000-07-01	298.483
2000-10-01	314.990
2001-01-01	281.870
2001-04-01	298.688
2001-07-01	297.015
2001-10-01	312.775
2002-01-01	333.401
2002-04-01	375.358
2002-07-01	372.829
2002-10-01	398.582
2003-01-01	436.313
2003-04-01	501.261
2003-07-01	519.764
2003-10-01	602.162
2004-01-01	620.933
2004-04-01	588.004
2004-07-01	623.809
2004-10-01	699.822
2005-01-01	705.462
2005-04-01	720.897
2005-07-01	738.930
2005-10-01	742.867
2006-01-01	744.473
2006-04-01	806.250
2006-07-01	831.675
2006-10-01	909.923
2007-01-01	961.581
2007-04-01	1050.971
2007-07-01	1144.885
2007-10-01	1211.822
2008-01-01	1300.576
2008-04-01	1422.469
2008-07-01	1225.739
2008-10-01	1064.987
2009-01-01	1089.705
2009-04-01	1301.295
2009-07-01	1433.131
2009-10-01	1484.104
2010-01-01	1528.111
2010-04-01	1444.758
2010-07-01	1656.453
2010-10-01	1758.255
2011-01-01	1819.825
2011-04-01	1885.408
2011-07-01	1740.283
2011-10-01	1844.654
2012-01-01	1911.190
2012-04-01	1910.180
2012-07-01	1964.218
2012-10-01	1970.758
2013-01-01	1992.998
2013-04-01	1795.109
2013-07-01	1834.731
2013-10-01	1788.016
2014-01-01	1869.822
2014-04-01	1940.652
2014-07-01	1823.219
2014-10-01	1743.880
2015-01-01	1643.149
2015-04-01	1695.571
2015-07-01	1582.565
2015-10-01	1675.162
2016-01-01	1790.602
2016-04-01	1763.093
2016-07-01	1827.125
2016-10-01	1764.341
2017-01-01	1882.550
2017-04-01	1921.881
2017-07-01	1974.016
2017-10-01	1990.605
2018-01-01	1973.847