Quarter	Millions of US Dollars
2001-01-01	9052
2001-04-01	9669
2001-07-01	9214
2001-10-01	6968
2002-01-01	6456
2002-04-01	7165
2002-07-01	7439
2002-10-01	9793
2003-01-01	11576
2003-04-01	13433
2003-07-01	15182
2003-10-01	15546
2004-01-01	16655
2004-04-01	17180
2004-07-01	19225
2004-10-01	24829
2005-01-01	23372
2005-04-01	22953
2005-07-01	25280
2005-10-01	26848
2006-01-01	28627
2006-04-01	26638
2006-07-01	28092
2006-10-01	32966
2007-01-01	33769
2007-04-01	36735
2007-07-01	40692
2007-10-01	42570
2008-01-01	36352
2008-04-01	39431
2008-07-01	38610
2008-10-01	33795
2009-01-01	35305
2009-04-01	41410
2009-07-01	43769
2009-10-01	43068
2010-01-01	44567
2010-04-01	44760
2010-07-01	48357
2010-10-01	50673
2011-01-01	53774
2011-04-01	53625
2011-07-01	46620
2011-10-01	46309
2012-01-01	52251
2012-04-01	50658
2012-07-01	50781
2012-10-01	49872
2013-01-01	46634
2013-04-01	43721
2013-07-01	43015
2013-10-01	41302
2014-01-01	42260
2014-04-01	43547
2014-07-01	40888
2014-10-01	40652
2015-01-01	39808
2015-04-01	40548
2015-07-01	35805
2015-10-01	32794
2016-01-01	33921
2016-04-01	34345
2016-07-01	36756
2016-10-01	37201
2017-01-01	39689
2017-04-01	41451
2017-07-01	40838
2017-10-01	45577
2018-01-01	47585