Quarter	Billions of US Dollars
1989-10-01	6.320
1990-01-01	6.234
1990-04-01	6.095
1990-07-01	5.508
1990-10-01	5.467
1991-01-01	5.467
1991-04-01	5.516
1991-07-01	5.669
1991-10-01	7.272
1992-01-01	7.635
1992-04-01	7.575
1992-07-01	7.715
1992-10-01	9.843
1993-01-01	9.682
1993-04-01	9.057
1993-07-01	8.285
1993-10-01	12.181
1994-01-01	12.103
1994-04-01	12.274
1994-07-01	12.601
1994-10-01	13.188
1995-01-01	12.417
1995-04-01	13.048
1995-07-01	12.946
1995-10-01	13.576
1996-01-01	13.733
1996-04-01	13.916
1996-07-01	14.070
1996-10-01	14.541
1997-01-01	14.475
1997-04-01	14.246
1997-07-01	9.978
1997-10-01	8.775
1998-01-01	9.699
1998-04-01	8.858
1998-07-01	8.451
1998-10-01	10.516
1999-01-01	10.933
1999-04-01	11.581
1999-07-01	10.894
1999-10-01	11.414
2000-01-01	11.916
2000-04-01	12.015
2000-07-01	11.834
2000-10-01	11.532
2001-01-01	12.879
2001-04-01	13.278
2001-07-01	14.696
2001-10-01	15.837
2002-01-01	17.122
2002-04-01	18.594
2002-07-01	19.052
2002-10-01	19.981
2003-01-01	20.516
2003-04-01	16.755
2003-07-01	21.348
2003-10-01	21.779
2004-01-01	22.422
2004-04-01	23.442
2004-07-01	24.326
2004-10-01	25.304
2005-01-01	27.065
2005-04-01	26.570
2005-07-01	27.414
2005-10-01	29.106
2006-01-01	30.529
2006-04-01	29.063
2006-07-01	30.296
2006-10-01	31.377
2007-01-01	33.136
2007-04-01	34.255
2007-07-01	36.169
2007-10-01	39.359
2008-01-01	39.056
2008-04-01	36.024
2008-07-01	36.252
2008-10-01	35.821
2009-01-01	34.669
2009-04-01	36.353
2009-07-01	39.592
2009-10-01	41.374
2010-01-01	44.269
2010-04-01	45.865
2010-07-01	50.652
2010-10-01	52.000
2011-01-01	54.096
2011-04-01	56.487
2011-07-01	56.762
2011-10-01	60.371
2012-01-01	65.763
2012-04-01	68.936
2012-07-01	75.659
2012-10-01	75.707
2013-01-01	76.816
2013-04-01	78.703
2013-07-01	80.255
2013-10-01	80.240
2014-01-01	76.180
2014-04-01	80.101
2014-07-01	78.875
2014-10-01	80.335
2015-01-01	80.773