Quarter	Billions of US Dollars
1989-10-01	13.462
1990-01-01	12.020
1990-04-01	12.968
1990-07-01	14.239
1990-10-01	13.208
1991-01-01	12.604
1991-04-01	12.976
1991-07-01	13.436
1991-10-01	13.147
1992-01-01	13.670
1992-04-01	14.034
1992-07-01	14.099
1992-10-01	13.521
1993-01-01	14.262
1993-04-01	15.287
1993-07-01	16.235
1993-10-01	16.013
1994-01-01	15.941
1994-04-01	17.517
1994-07-01	18.775
1994-10-01	19.448
1995-01-01	19.718
1995-04-01	20.274
1995-07-01	20.728
1995-10-01	20.475
1996-01-01	20.724
1996-04-01	21.905
1996-07-01	23.229
1996-10-01	22.701
1997-01-01	20.640
1997-04-01	20.454
1997-07-01	19.601
1997-10-01	17.967
1998-01-01	16.359
1998-04-01	16.461
1998-07-01	15.952
1998-10-01	17.050
1999-01-01	17.270
1999-04-01	17.328
1999-07-01	17.085
1999-10-01	17.163
2000-01-01	15.526
2000-04-01	14.972
2000-07-01	13.182
2000-10-01	14.732
2001-01-01	12.779
2001-04-01	13.443
2001-07-01	13.937
2001-10-01	14.294
2002-01-01	14.690
2002-04-01	16.781
2002-07-01	16.442
2002-10-01	18.880
2003-01-01	19.949
2003-04-01	19.816
2003-07-01	22.206
2003-10-01	24.593
2004-01-01	24.531
2004-04-01	21.110
2004-07-01	23.425
2004-10-01	25.583
2005-01-01	23.580
2005-04-01	23.541
2005-07-01	23.797
2005-10-01	24.040
2006-01-01	20.324
2006-04-01	20.499
2006-07-01	21.237
2006-10-01	20.818
2007-01-01	20.928
2007-04-01	23.010
2007-07-01	23.171
2007-10-01	24.015
2008-01-01	24.263
2008-04-01	23.904
2008-07-01	19.926
2008-10-01	18.412
2009-01-01	20.911
2009-04-01	25.879
2009-07-01	29.931
2009-10-01	31.440
2010-01-01	32.164
2010-04-01	32.493
2010-07-01	36.410
2010-10-01	40.652
2011-01-01	45.426
2011-04-01	54.979
2011-07-01	54.795
2011-10-01	54.703
2012-01-01	58.141
2012-04-01	59.632
2012-07-01	62.453
2012-10-01	65.019
2013-01-01	66.888
2013-04-01	55.945
2013-07-01	61.157
2013-10-01	64.606
2014-01-01	67.482
2014-04-01	67.476
2014-07-01	61.393
2014-10-01	64.399
2015-01-01	63.186
2015-04-01	53.854
2015-07-01	50.728
2015-10-01	56.093
2016-01-01	55.936
2016-04-01	59.353
2016-07-01	61.727
2016-10-01	58.553
2017-01-01	59.553
2017-04-01	62.552
2017-07-01	62.387
2017-10-01	58.282
2018-01-01	61.227