Quarter	Millions of US Dollars
2007-10-01	6398
2008-01-01	7073
2008-04-01	6875
2008-07-01	6566
2008-10-01	6230
2009-01-01	6248
2009-04-01	6753
2009-07-01	7258
2009-10-01	7400
2010-01-01	7692
2010-04-01	8223
2010-07-01	8687
2010-10-01	10153
2011-01-01	10183
2011-04-01	10383
2011-07-01	10392
2011-10-01	10803
2012-01-01	11605
2012-04-01	11671
2012-07-01	12234
2012-10-01	12566
2013-01-01	13151
2013-04-01	12674
2013-07-01	12611
2013-10-01	12734
2014-01-01	12802
2014-04-01	13316
2014-07-01	13308
2014-10-01	14539
2015-01-01	14977
2015-04-01	14697
2015-07-01	14719
2015-10-01	13974
2016-01-01	15110
2016-04-01	15784
2016-07-01	16098
2016-10-01	18781
2017-01-01	20914
2017-04-01	22142
2017-07-01	26035
2017-10-01	26631
2018-01-01	27176