Quarter	Billions of US Dollars
1989-10-01	2.972
1990-01-01	3.200
1990-04-01	3.321
1990-07-01	3.522
1990-10-01	3.789
1991-01-01	4.272
1991-04-01	4.310
1991-07-01	4.563
1991-10-01	4.729
1992-01-01	4.764
1992-04-01	5.015
1992-07-01	5.344
1992-10-01	5.326
1993-01-01	5.522
1993-04-01	5.920
1993-07-01	6.254
1993-10-01	6.505
1994-01-01	6.666
1994-04-01	6.961
1994-07-01	7.690
1994-10-01	7.606
1995-01-01	8.569
1995-04-01	8.887
1995-07-01	8.596
1995-10-01	9.057
1996-01-01	9.595
1996-04-01	9.937
1996-07-01	10.021
1996-10-01	10.366
1997-01-01	10.041
1997-04-01	10.273
1997-07-01	9.624
1997-10-01	8.935
1998-01-01	9.664
1998-04-01	9.503
1998-07-01	10.884
1998-10-01	12.099
1999-01-01	12.435
1999-04-01	13.266
1999-07-01	13.297
1999-10-01	13.890
2000-01-01	14.317
2000-04-01	15.156
2000-07-01	16.088
2000-10-01	17.245
2001-01-01	18.306
2001-04-01	18.443
2001-07-01	20.271
2001-10-01	21.059
2002-01-01	21.536
2002-04-01	21.366
2002-07-01	22.791
2002-10-01	23.783
2003-01-01	24.128
2003-04-01	23.852
2003-07-01	26.063
2003-10-01	26.958
2004-01-01	27.844
2004-04-01	26.103
2004-07-01	30.045
2004-10-01	31.828
2005-01-01	31.034
2005-04-01	31.785
2005-07-01	35.048
2005-10-01	34.070
2006-01-01	35.531
2006-04-01	37.498
2006-07-01	37.810
2006-10-01	39.124
2007-01-01	38.162
2007-04-01	41.368
2007-07-01	44.872
2007-10-01	45.240
2008-01-01	49.351
2008-04-01	50.676
2008-07-01	47.506
2008-10-01	47.735
2009-01-01	44.031
2009-04-01	48.076
2009-07-01	51.835
2009-10-01	51.019
2010-01-01	53.393
2010-04-01	53.522
2010-07-01	55.863
2010-10-01	58.408
2011-01-01	59.761
2011-04-01	65.571
2011-07-01	59.679
2011-10-01	61.044
2012-01-01	67.292
2012-04-01	65.243
2012-07-01	69.610
2012-10-01	67.511
2013-01-01	69.717
2013-04-01	68.132
2013-07-01	66.417
2013-10-01	67.968
2014-01-01	68.941
2014-04-01	73.819
2014-07-01	73.224
2014-10-01	68.190
2015-01-01	66.836