Quarter	Millions of US Dollars
2004-10-01	197598
2005-01-01	204039
2005-04-01	206965
2005-07-01	212168
2005-10-01	213845
2006-01-01	217774
2006-04-01	193182
2006-07-01	202000
2006-10-01	214682
2007-01-01	230995
2007-04-01	232902
2007-07-01	255366
2007-10-01	259030
2008-01-01	242239
2008-04-01	252738
2008-07-01	249424
2008-10-01	216749
2009-01-01	215268
2009-04-01	238126
2009-07-01	257626
2009-10-01	262454
2010-01-01	266568
2010-04-01	259480
2010-07-01	285685
2010-10-01	275311
2011-01-01	286405
2011-04-01	280181
2011-07-01	253690
2011-10-01	253625
2012-01-01	275244
2012-04-01	277247
2012-07-01	288431
2012-10-01	297473
2013-01-01	301070
2013-04-01	295355
2013-07-01	291541
2013-10-01	285122
2014-01-01	290766
2014-04-01	301527
2014-07-01	290658
2014-10-01	293210
2015-01-01	275158
2015-04-01	276022
2015-07-01	257263
2015-10-01	263023
2016-01-01	274984
2016-04-01	276824
2016-07-01	269902
2016-10-01	249144
2017-01-01	252449
2017-04-01	270258
2017-07-01	279898
2017-10-01	276459
2018-01-01	279770