Quarter	Millions of US Dollars
2001-01-01	2739
2001-04-01	2735
2001-07-01	2655
2001-10-01	2244
2002-01-01	2482
2002-04-01	2887
2002-07-01	3571
2002-10-01	4715
2003-01-01	5426
2003-04-01	5897
2003-07-01	6748
2003-10-01	8101
2004-01-01	9118
2004-04-01	9834
2004-07-01	9812
2004-10-01	12410
2005-01-01	11701
2005-04-01	11497
2005-07-01	13701
2005-10-01	15793
2006-01-01	16952
2006-04-01	16821
2006-07-01	17639
2006-10-01	21143
2007-01-01	21864
2007-04-01	23758
2007-07-01	25409
2007-10-01	27043
2008-01-01	23848
2008-04-01	25261
2008-07-01	24277
2008-10-01	20899
2009-01-01	20728
2009-04-01	25646
2009-07-01	28344
2009-10-01	29332
2010-01-01	30522
2010-04-01	30142
2010-07-01	32755
2010-10-01	35463
2011-01-01	36849
2011-04-01	37125
2011-07-01	32463
2011-10-01	33550
2012-01-01	38591
2012-04-01	38769
2012-07-01	39301
2012-10-01	40356
2013-01-01	37021
2013-04-01	34664
2013-07-01	34355
2013-10-01	34292
2014-01-01	35466
2014-04-01	37385
2014-07-01	34934
2014-10-01	34968
2015-01-01	33454
2015-04-01	34369
2015-07-01	30659
2015-10-01	28460
2016-01-01	29731
2016-04-01	30477
2016-07-01	32843
2016-10-01	33114
2017-01-01	35457
2017-04-01	36684
2017-07-01	36154
2017-10-01	40709
2018-01-01	43034