Quarter	Millions of US Dollars
1989-01-01	36870
1989-04-01	38088
1989-07-01	41867
1989-10-01	42577
1990-01-01	45077
1990-04-01	45664
1990-07-01	47403
1990-10-01	47689
1991-01-01	48432
1991-04-01	50864
1991-07-01	52635
1991-10-01	50987
1992-01-01	51324
1992-04-01	51207
1992-07-01	48796
1992-10-01	47793
1993-01-01	49035
1993-04-01	48399
1993-07-01	46964
1993-10-01	46806
1994-01-01	46714
1994-04-01	47501
1994-07-01	49809
1994-10-01	48610
1995-01-01	47859
1995-04-01	49288
1995-07-01	52967
1995-10-01	52924
1996-01-01	52860
1996-04-01	53471
1996-07-01	53571
1996-10-01	54776
1997-01-01	56347
1997-04-01	57585
1997-07-01	60875
1997-10-01	60892
1998-01-01	65415
1998-04-01	66071
1998-07-01	64568
1998-10-01	60304
1999-01-01	65152
1999-04-01	67182
1999-07-01	70264
1999-10-01	72560
2000-01-01	74224
2000-04-01	76966
2000-07-01	77948
2000-10-01	78788
2001-01-01	74078
2001-04-01	79389
2001-07-01	78447
2001-10-01	78294
2002-01-01	81154
2002-04-01	82697
2002-07-01	79638
2002-10-01	79497
2003-01-01	85941
2003-04-01	94962
2003-07-01	96386
2003-10-01	100741
2004-01-01	99215
2004-04-01	97439
2004-07-01	103583
2004-10-01	110983
2005-01-01	111090
2005-04-01	109011
2005-07-01	116335
2005-10-01	117739
2006-01-01	116230
2006-04-01	120648
2006-07-01	122233
2006-10-01	117995
2007-01-01	119897
2007-04-01	129701
2007-07-01	136560
2007-10-01	139197
2008-01-01	137885
2008-04-01	141120
2008-07-01	137254
2008-10-01	114843
2009-01-01	114766
2009-04-01	130143
2009-07-01	140901
2009-10-01	151534
2010-01-01	161331
2010-04-01	159970
2010-07-01	166498
2010-10-01	179198
2011-01-01	191022
2011-04-01	200322
2011-07-01	189573
2011-10-01	193504
2012-01-01	202323
2012-04-01	201890
2012-07-01	213678
2012-10-01	217080
2013-01-01	217651
2013-04-01	219377
2013-07-01	235680
2013-10-01	232022
2014-01-01	230690
2014-04-01	244866
2014-07-01	243710
2014-10-01	233475
2015-01-01	216050
2015-04-01	223729
2015-07-01	211228
2015-10-01	205359
2016-01-01	220671
2016-04-01	220167
2016-07-01	219185
2016-10-01	217164
2017-01-01	220799
2017-04-01	232275
2017-07-01	249659
2017-10-01	250205
2018-01-01	249405