Quarter	Millions of US Dollars
2004-10-01	197249
2005-01-01	204039
2005-04-01	206965
2005-07-01	212168
2005-10-01	213835
2006-01-01	217765
2006-04-01	193174
2006-07-01	201925
2006-10-01	214588
2007-01-01	230899
2007-04-01	232810
2007-07-01	254622
2007-10-01	257761
2008-01-01	241789
2008-04-01	252247
2008-07-01	248909
2008-10-01	216288
2009-01-01	214906
2009-04-01	237758
2009-07-01	257213
2009-10-01	262008
2010-01-01	265987
2010-04-01	258783
2010-07-01	283646
2010-10-01	272152
2011-01-01	280293
2011-04-01	269954
2011-07-01	243236
2011-10-01	242075
2012-01-01	260121
2012-04-01	258136
2012-07-01	266388
2012-10-01	267937
2013-01-01	267587
2013-04-01	257800
2013-07-01	253004
2013-10-01	243170
2014-01-01	247577
2014-04-01	250635
2014-07-01	236269
2014-10-01	235707
2015-01-01	217769
2015-04-01	218430
2015-07-01	202936
2015-10-01	208201
2016-01-01	217891
2016-04-01	218492
2016-07-01	213235
2016-10-01	193361
2017-01-01	194895
2017-04-01	207163
2017-07-01	213241
2017-10-01	207804
2018-01-01	206586