Quarter	Millions of US Dollars
2005-01-01	5102
2005-04-01	5538
2005-07-01	6024
2005-10-01	6737
2006-01-01	6375
2006-04-01	7458
2006-07-01	7284
2006-10-01	8337
2007-01-01	9192
2007-04-01	9993
2007-07-01	10537
2007-10-01	12258
2008-01-01	13464
2008-04-01	15261
2008-07-01	14863
2008-10-01	15321
2009-01-01	14633
2009-04-01	15925
2009-07-01	15889
2009-10-01	15997
2010-01-01	17110
2010-04-01	19242
2010-07-01	20860
2010-10-01	21542
2011-01-01	21877
2011-04-01	22568
2011-07-01	22993
2011-10-01	23863
2012-01-01	25344
2012-04-01	24440
2012-07-01	26517
2012-10-01	26153
2013-01-01	25273
2013-04-01	23365
2013-07-01	23352
2013-10-01	24064
2014-01-01	24723
2014-04-01	25770
2014-07-01	27629
2014-10-01	26066
2015-01-01	24744
2015-04-01	24090
2015-07-01	20269
2015-10-01	22163
2016-01-01	24272
2016-04-01	22277
2016-07-01	20379
2016-10-01	18502
2017-01-01	19821
2017-04-01	20922
2017-07-01	20492
2017-10-01	21188
2018-01-01	22832