Quarter	Millions of US Dollars
1995-01-01	30063
1995-04-01	31118
1995-07-01	32851
1995-10-01	33568
1996-01-01	34963
1996-04-01	34744
1996-07-01	36242
1996-10-01	37763
1997-01-01	38706
1997-04-01	37385
1997-07-01	39539
1997-10-01	38117
1998-01-01	36878
1998-04-01	36411
1998-07-01	36316
1998-10-01	35150
1999-01-01	36048
1999-04-01	36351
1999-07-01	35365
1999-10-01	37337
2000-01-01	39430
2000-04-01	38729
2000-07-01	39015
2000-10-01	38900
2001-01-01	38406
2001-04-01	40169
2001-07-01	39051
2001-10-01	41168
2002-01-01	39937
2002-04-01	38846
2002-07-01	38379
2002-10-01	41584
2003-01-01	44411
2003-04-01	51521
2003-07-01	50286
2003-10-01	53022
2004-01-01	52367
2004-04-01	52987
2004-07-01	54598
2004-10-01	58458
2005-01-01	58979
2005-04-01	56524
2005-07-01	58013
2005-10-01	56754
2006-01-01	57805
2006-04-01	57044
2006-07-01	59940
2006-10-01	62713
2007-01-01	64529
2007-04-01	59757
2007-07-01	65821
2007-10-01	71189
2008-01-01	77660
2008-04-01	86879
2008-07-01	86606
2008-10-01	83316
2009-01-01	79626
2009-04-01	88107
2009-07-01	96460
2009-10-01	97097
2010-01-01	99769
2010-04-01	95569
2010-07-01	104776
2010-10-01	109753
2011-01-01	110273
2011-04-01	111033
2011-07-01	105058
2011-10-01	106951
2012-01-01	110774
2012-04-01	106981
2012-07-01	111380
2012-10-01	123067
2013-01-01	125711
2013-04-01	129960
2013-07-01	134136
2013-10-01	138451
2014-01-01	139240
2014-04-01	144681
2014-07-01	134813
2014-10-01	127634
2015-01-01	128605
2015-04-01	130299
2015-07-01	126791
2015-10-01	128839
2016-01-01	135686
2016-04-01	134238
2016-07-01	134974
2016-10-01	129863
2017-01-01	135224
2017-04-01	142557
2017-07-01	141866
2017-10-01	141695
2018-01-01	139602