Quarter	Billions of US Dollars
2000-01-01	1.513
2000-04-01	1.510
2000-07-01	1.402
2000-10-01	1.556
2001-01-01	1.434
2001-04-01	1.385
2001-07-01	1.501
2001-10-01	1.531
2002-01-01	1.483
2002-04-01	1.706
2002-07-01	1.696
2002-10-01	1.854
2003-01-01	1.859
2003-04-01	2.007
2003-07-01	2.101
2003-10-01	2.296
2004-01-01	2.065
2004-04-01	2.108
2004-07-01	2.242
2004-10-01	2.795
2005-01-01	2.603
2005-04-01	2.394
2005-07-01	2.465
2005-10-01	2.615
2006-01-01	2.905
2006-04-01	3.111
2006-07-01	3.185
2006-10-01	3.462
2007-01-01	3.524
2007-04-01	3.834
2007-07-01	4.028
2007-10-01	4.221
2008-01-01	4.869
2008-04-01	4.924
2008-07-01	4.482
2008-10-01	7.911
2009-01-01	7.430
2009-04-01	7.941
2009-07-01	8.398
2009-10-01	8.377
2010-01-01	8.035
2010-04-01	9.818
2010-07-01	11.000
2010-10-01	10.623
2011-01-01	11.476
2011-04-01	11.740
2011-07-01	10.971
2011-10-01	10.446
2012-01-01	12.567
2012-04-01	12.113
2012-07-01	12.463
2012-10-01	12.797
2013-01-01	13.596
2013-04-01	14.132
2013-07-01	17.562
2013-10-01	15.183
2014-01-01	15.122
2014-04-01	15.036
2014-07-01	13.893
2014-10-01	13.755
2015-01-01	12.165
2015-04-01	12.654
2015-07-01	12.708
2015-10-01	12.462
2016-01-01	13.271
2016-04-01	12.776
2016-07-01	12.748
2016-10-01	11.620
2017-01-01	13.686
2017-04-01	14.417
2017-07-01	15.100
2017-10-01	15.242
2018-01-01	15.362