Quarter	Billions of US Dollars
1995-10-01	6.310
1996-01-01	6.268
1996-04-01	6.327
1996-07-01	5.856
1996-10-01	5.394
1997-01-01	7.369
1997-04-01	6.451
1997-07-01	5.320
1997-10-01	4.613
1998-01-01	4.977
1998-04-01	5.171
1998-07-01	5.713
1998-10-01	5.145
1999-01-01	5.121
1999-04-01	5.127
1999-07-01	5.743
1999-10-01	4.821
2000-01-01	3.993
2000-04-01	4.311
2000-07-01	4.924
2000-10-01	5.101
2001-01-01	5.988
2001-04-01	6.933
2001-07-01	5.454
2001-10-01	6.015
2002-01-01	6.495
2002-04-01	8.148
2002-07-01	8.664
2002-10-01	10.010
2003-01-01	10.574
2003-04-01	11.147
2003-07-01	11.566
2003-10-01	13.133
2004-01-01	13.134
2004-04-01	14.296
2004-07-01	15.289
2004-10-01	18.602
2005-01-01	19.328
2005-04-01	18.994
2005-07-01	19.977
2005-10-01	21.568
2006-01-01	23.148
2006-04-01	25.997
2006-07-01	27.576
2006-10-01	31.732
2007-01-01	33.088
2007-04-01	35.067
2007-07-01	41.040
2007-10-01	48.709
2008-01-01	56.170
2008-04-01	62.710
2008-07-01	57.547
2008-10-01	53.603
2009-01-01	51.415
2009-04-01	58.761
2009-07-01	63.628
2009-10-01	60.600
2010-01-01	59.182
2010-04-01	52.906
2010-07-01	62.272
2010-10-01	60.835
2011-01-01	66.390
2011-04-01	68.984
2011-07-01	64.278
2011-10-01	60.109
2012-01-01	64.950
2012-04-01	59.684
2012-07-01	63.056
2012-10-01	65.249
2013-01-01	62.019
2013-04-01	63.738
2013-07-01	67.043
2013-10-01	64.836
2014-01-01	65.033
2014-04-01	64.682
2014-07-01	59.303
2014-10-01	57.365
2015-01-01	51.404
2015-04-01	54.972
2015-07-01	56.088
2015-10-01	55.881
2016-01-01	58.840
2016-04-01	58.391
2016-07-01	60.193
2016-10-01	58.017
2017-01-01	59.630
2017-04-01	67.095
2017-07-01	71.269
2017-10-01	75.025
2018-01-01	78.399