Quarter	Billions of US Dollars
1980-10-01	86.632
1981-01-01	90.039
1981-04-01	96.964
1981-07-01	101.790
1981-10-01	110.236
1982-01-01	74.707
1982-04-01	73.549
1982-07-01	54.490
1982-10-01	26.294
1983-01-01	27.503
1983-04-01	31.125
1983-07-01	32.352
1983-10-01	34.973
1984-01-01	34.946
1984-04-01	39.589
1984-07-01	42.743
1984-10-01	49.555
1985-01-01	52.221
1985-04-01	53.657
1985-07-01	45.792
1985-10-01	43.693
1986-01-01	43.950
1986-04-01	42.301
1986-07-01	40.451
1986-10-01	39.552
1987-01-01	37.350
1987-04-01	38.024
1987-07-01	39.038
1987-10-01	38.557
1988-01-01	35.996
1988-04-01	36.588
1988-07-01	38.364
1988-10-01	44.805
1989-01-01	44.507
1989-04-01	49.174
1989-07-01	53.799
1989-10-01	63.863
1990-01-01	58.354
1990-04-01	65.981
1990-07-01	70.339
1990-10-01	81.706
1991-01-01	87.267
1991-04-01	98.387
1991-07-01	107.522
1991-10-01	127.003
1992-01-01	137.838
1992-04-01	149.463
1992-07-01	163.572
1992-10-01	177.822
1993-01-01	190.079
1993-04-01	201.891
1993-07-01	213.822
1993-10-01	226.751
1994-01-01	221.376
1994-04-01	233.075
1994-07-01	244.307
1994-10-01	176.267
1995-01-01	138.883
1995-04-01	161.954
1995-07-01	168.968
1995-10-01	147.895
1996-01-01	156.047
1996-04-01	159.049
1996-07-01	163.767
1996-10-01	161.002
1997-01-01	167.797
1997-04-01	171.653
1997-07-01	174.140
1997-10-01	169.921
1998-01-01	168.119
1998-04-01	167.021
1998-07-01	153.946
1998-10-01	155.758
1999-01-01	163.148
1999-04-01	168.655
1999-07-01	163.777
1999-10-01	163.321
2000-01-01	169.754
2000-04-01	168.671
2000-07-01	176.119
2000-10-01	175.056
2001-01-01	177.535
2001-04-01	180.607
2001-07-01	175.276
2001-10-01	184.196
2002-01-01	183.567
2002-04-01	173.669
2002-07-01	173.754
2002-10-01	175.656
2003-01-01	172.932
2003-04-01	179.502
2003-07-01	174.408
2003-10-01	174.479
2004-01-01	177.890
2004-04-01	175.093
2004-07-01	180.932
2004-10-01	189.028
2005-01-01	194.308
2005-04-01	204.572
2005-07-01	204.779
2005-10-01	215.205
2006-01-01	217.249
2006-04-01	220.440
2006-07-01	233.227
2006-10-01	250.279
2007-01-01	254.177
2007-04-01	265.226
2007-07-01	277.076
2007-10-01	297.309
2008-01-01	310.082
2008-04-01	326.705
2008-07-01	320.797
2008-10-01	267.498
2009-01-01	267.440
2009-04-01	279.863
2009-07-01	273.173
2009-10-01	280.064
2010-01-01	302.217
2010-04-01	300.601
2010-07-01	311.077
2010-10-01	321.851
2011-01-01	345.733
2011-04-01	356.829
2011-07-01	328.074
2011-10-01	335.063
2012-01-01	367.122
2012-04-01	360.880
2012-07-01	385.913
2012-10-01	389.313
2013-01-01	411.807
2013-04-01	405.181
2013-07-01	416.615
2013-10-01	437.187
2014-01-01	444.345
2014-04-01	460.299
2014-07-01	453.912
2014-10-01	435.065
2015-01-01	427.120
2015-04-01	432.152
2015-07-01	425.607
2015-10-01	426.486
2016-01-01	448.348
2016-04-01	433.193
2016-07-01	429.096
2016-10-01	418.700
2017-01-01	455.412
2017-04-01	477.734
2017-07-01	490.079
2017-10-01	474.928
2018-01-01	509.063