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	39768
1999-04-01	40379
1999-07-01	39241
1999-10-01	41469
2000-01-01	43517
2000-04-01	42724
2000-07-01	42944
2000-10-01	42607
2001-01-01	41893
2001-04-01	43990
2001-07-01	43067
2001-10-01	45273
2002-01-01	44292
2002-04-01	43223
2002-07-01	42561
2002-10-01	45859
2003-01-01	48956
2003-04-01	56764
2003-07-01	55610
2003-10-01	58745
2004-01-01	58741
2004-04-01	60726
2004-07-01	62909
2004-10-01	67560
2005-01-01	70700
2005-04-01	71337
2005-07-01	75338
2005-10-01	75059
2006-01-01	77226
2006-04-01	79136
2006-07-01	84446
2006-10-01	89114
2007-01-01	93713
2007-04-01	95984
2007-07-01	106514
2007-10-01	117278
2008-01-01	130035
2008-04-01	144965
2008-07-01	138429
2008-10-01	122991
2009-01-01	119889
2009-04-01	137642
2009-07-01	152588
2009-10-01	155131
2010-01-01	162149
2010-04-01	155733
2010-07-01	173236
2010-10-01	180839
2011-01-01	183205
2011-04-01	184410
2011-07-01	171883
2011-10-01	171968
2012-01-01	179762
2012-04-01	170553
2012-07-01	177531
2012-10-01	194243
2013-01-01	200034
2013-04-01	204859
2013-07-01	211787
2013-10-01	217027
2014-01-01	216957
2014-04-01	223214
2014-07-01	210595
2014-10-01	194977
2015-01-01	194378
2015-04-01	199062
2015-07-01	193992
2015-10-01	196003
2016-01-01	207322
2016-04-01	205029
2016-07-01	211442
2016-10-01	204393
2017-01-01	215475
2017-04-01	228391
2017-07-01	226886
2017-10-01	229656
2018-01-01	228079