Quarter	Billions of US Dollars
1998-10-01	2.018
1999-01-01	1.958
1999-04-01	1.863
1999-07-01	1.888
1999-10-01	1.702
2000-01-01	1.574
2000-04-01	1.568
2000-07-01	1.453
2000-10-01	1.618
2001-01-01	1.498
2001-04-01	1.443
2001-07-01	1.570
2001-10-01	1.593
2002-01-01	1.536
2002-04-01	1.771
2002-07-01	1.770
2002-10-01	1.888
2003-01-01	1.895
2003-04-01	2.044
2003-07-01	2.134
2003-10-01	2.324
2004-01-01	2.093
2004-04-01	2.130
2004-07-01	2.260
2004-10-01	2.813
2005-01-01	2.619
2005-04-01	2.406
2005-07-01	2.475
2005-10-01	2.624
2006-01-01	2.907
2006-04-01	3.112
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	4.481
2008-10-01	7.972
2009-01-01	7.526
2009-04-01	8.042
2009-07-01	8.552
2009-10-01	8.506
2010-01-01	8.199
2010-04-01	10.077
2010-07-01	11.378
2010-10-01	10.798
2011-01-01	11.544
2011-04-01	11.914
2011-07-01	11.349
2011-10-01	10.829
2012-01-01	12.965
2012-04-01	12.571
2012-07-01	13.024
2012-10-01	13.400
2013-01-01	14.107
2013-04-01	14.472
2013-07-01	17.887
2013-10-01	15.461
2014-01-01	15.650
2014-04-01	15.813
2014-07-01	14.832
2014-10-01	14.846
2015-01-01	13.407
2015-04-01	13.620
2015-07-01	13.773
2015-10-01	13.441
2016-01-01	14.520
2016-04-01	14.035
2016-07-01	14.008
2016-10-01	12.654
2017-01-01	14.643
2017-04-01	15.351
2017-07-01	16.053
2017-10-01	16.179
2018-01-01	16.271