Quarter	Millions of US Dollars
2004-01-01	3375
2004-04-01	3501
2004-07-01	3585
2004-10-01	3907
2005-01-01	3884
2005-04-01	3680
2005-07-01	3645
2005-10-01	3615
2006-01-01	3748
2006-04-01	3770
2006-07-01	3805
2006-10-01	3948
2007-01-01	4029
2007-04-01	4116
2007-07-01	4354
2007-10-01	4588
2008-01-01	4905
2008-04-01	5157
2008-07-01	4745
2008-10-01	4632
2009-01-01	4592
2009-04-01	5129
2009-07-01	5395
2009-10-01	5327
2010-01-01	5118
2010-04-01	4813
2010-07-01	5470
2010-10-01	5330
2011-01-01	5874
2011-04-01	6157
2011-07-01	5662
2011-10-01	5579
2012-01-01	6072
2012-04-01	5897
2012-07-01	5867
2012-10-01	5945
2013-01-01	6189
2013-04-01	6458
2013-07-01	6852
2013-10-01	6701
2014-01-01	7050
2014-04-01	7359
2014-07-01	6582
2014-10-01	6119
2015-01-01	5676
2015-04-01	5951
2015-07-01	5985
2015-10-01	5713
2016-01-01	6288
2016-04-01	6160
2016-07-01	6146
2016-10-01	5756
2017-01-01	6002
2017-04-01	6363
2017-07-01	6490
2017-10-01	6321
2018-01-01	6595