Quarter	Millions of US Dollars
2005-01-01	146843
2005-04-01	152126
2005-07-01	165269
2005-10-01	167120
2006-01-01	169918
2006-04-01	149984
2006-07-01	153145
2006-10-01	169750
2007-01-01	182321
2007-04-01	182639
2007-07-01	205962
2007-10-01	210857
2008-01-01	198760
2008-04-01	208069
2008-07-01	199860
2008-10-01	166444
2009-01-01	163598
2009-04-01	184673
2009-07-01	201878
2009-10-01	207868
2010-01-01	211778
2010-04-01	207859
2010-07-01	233533
2010-10-01	221680
2011-01-01	228719
2011-04-01	219764
2011-07-01	196916
2011-10-01	195307
2012-01-01	210779
2012-04-01	207743
2012-07-01	214746
2012-10-01	214486
2013-01-01	215183
2013-04-01	203941
2013-07-01	200268
2013-10-01	187733
2014-01-01	189923
2014-04-01	192559
2014-07-01	178485
2014-10-01	177295
2015-01-01	161064
2015-04-01	159341
2015-07-01	143323
2015-10-01	150583
2016-01-01	157687
2016-04-01	155788
2016-07-01	152245
2016-10-01	132294
2017-01-01	131699
2017-04-01	139748
2017-07-01	146157
2017-10-01	140706
2018-01-01	137946