Quarter	Millions of US Dollars
2000-01-01	3558
2000-04-01	4611
2000-07-01	5307
2000-10-01	5706
2001-01-01	6317
2001-04-01	8197
2001-07-01	13026
2001-10-01	13888
2002-01-01	13460
2002-04-01	14660
2002-07-01	14756
2002-10-01	15703
2003-01-01	15583
2003-04-01	15989
2003-07-01	18138
2003-10-01	19447
2004-01-01	21086
2004-04-01	22831
2004-07-01	26569
2004-10-01	30020
2005-01-01	32816
2005-04-01	31543
2005-07-01	32743
2005-10-01	34925
2006-01-01	37072
2006-04-01	42710
2006-07-01	43994
2006-10-01	47793
2007-01-01	50829
2007-04-01	51912
2007-07-01	53599
2007-10-01	54713
2008-01-01	57896
2008-04-01	57863
2008-07-01	55281
2008-10-01	53741
2009-01-01	51424
2009-04-01	50745
2009-07-01	51229
2009-10-01	53200
2010-01-01	54348
2010-04-01	54343
2010-07-01	60934
2010-10-01	62126
2011-01-01	54949
2011-04-01	60749
2011-07-01	66318
2011-10-01	68665
2012-01-01	86511
2012-04-01	89905
2012-07-01	100941
2012-10-01	98027
2013-01-01	115054
2013-04-01	127611
2013-07-01	141097
2013-10-01	148444
2014-01-01	161520
2014-04-01	180190
2014-07-01	192081
2014-10-01	178464
2015-01-01	164067
2015-04-01	173096
2015-07-01	152396
2015-10-01	149257
2016-01-01	145209
2016-04-01	152392
2016-07-01	148505
2016-10-01	152780
2017-01-01	171592
2017-04-01	174702
2017-07-01	183362
2017-10-01	190641
2018-01-01	198524