Quarter	Millions of US Dollars
2005-10-01	74070
2006-01-01	78094
2006-04-01	79525
2006-07-01	66922
2006-10-01	68605
2007-01-01	64754
2007-04-01	63843
2007-07-01	56732
2007-10-01	66002
2008-01-01	66773
2008-04-01	75916
2008-07-01	68079
2008-10-01	61608
2009-01-01	56090
2009-04-01	126931
2009-07-01	122595
2009-10-01	130655
2010-01-01	139444
2010-04-01	138422
2010-07-01	145290
2010-10-01	151889
2011-01-01	158756
2011-04-01	163724
2011-07-01	139671
2011-10-01	141185
2012-01-01	157355
2012-04-01	152409
2012-07-01	158583
2012-10-01	162361
2013-01-01	171949
2013-04-01	166157
2013-07-01	162867
2013-10-01	173296
2014-01-01	174480
2014-04-01	179480
2014-07-01	174232
2014-10-01	167072
2015-01-01	161597
2015-04-01	161959
2015-07-01	151100
2015-10-01	149392
2016-01-01	151361
2016-04-01	144813
2016-07-01	139166
2016-10-01	134881
2017-01-01	148090
2017-04-01	158775
2017-07-01	162008
2017-10-01	151079
2018-01-01	166373