Quarter	Millions of US Dollars
2001-10-01	3262
2002-10-01	4517
2003-10-01	5328
2004-10-01	6175
2005-10-01	7053
2006-10-01	9433
2007-01-01	10058
2007-04-01	10250
2007-07-01	10581
2007-10-01	11538
2008-01-01	12516
2008-04-01	12202
2008-07-01	11047
2008-10-01	11368
2009-01-01	10761
2009-04-01	11712
2009-07-01	12421
2009-10-01	12577
2010-01-01	12676
2010-04-01	11767
2010-07-01	13887
2010-10-01	13603
2011-01-01	14832
2011-04-01	14591
2011-07-01	14024
2011-10-01	13765
2012-01-01	15266
2012-04-01	13838
2012-07-01	14753
2012-10-01	15121
2013-01-01	15186
2013-04-01	15735
2013-07-01	16370
2013-10-01	16974
2014-01-01	17680
2014-04-01	17719
2014-07-01	16123
2014-10-01	16256
2015-01-01	14558
2015-04-01	15148
2015-07-01	15250
2015-10-01	14873
2016-01-01	16351
2016-04-01	15735
2016-07-01	16639
2016-10-01	15746
2017-01-01	16572
2017-04-01	17915
2017-07-01	18786
2017-10-01	19335
2018-01-01	20100