Quarter	Millions of US Dollars
1989-10-01	3127
1990-01-01	3098
1990-04-01	3171
1990-07-01	3468
1990-10-01	3639
1991-01-01	3122
1991-04-01	2943
1991-07-01	3255
1991-10-01	3521
1992-01-01	3305
1992-04-01	3640
1992-07-01	4109
1992-10-01	3607
1993-01-01	3771
1993-04-01	3790
1993-07-01	4210
1993-10-01	4099
1994-01-01	4628
1994-04-01	4685
1994-07-01	4902
1994-10-01	5536
1995-01-01	6750
1995-04-01	6951
1995-07-01	6844
1995-10-01	7142
1996-01-01	4474
1996-04-01	4175
1996-07-01	4108
1996-10-01	3833
1997-01-01	3630
1997-04-01	3606
1997-07-01	3640
1997-10-01	4424
1998-01-01	4814
1998-04-01	5033
1998-07-01	5375
1998-10-01	5388
1999-01-01	13752
1999-04-01	12902
1999-07-01	14066
1999-10-01	13323
2000-01-01	12467
2000-04-01	12173
2000-07-01	11490
2000-10-01	12122
2001-01-01	11368
2001-04-01	11147
2001-07-01	12353
2001-10-01	12250
2002-01-01	11475
2002-04-01	13577
2002-07-01	13873
2002-10-01	14495
2003-01-01	14768
2003-04-01	15301
2003-07-01	17721
2003-10-01	22002
2004-01-01	21426
2004-04-01	22509
2004-07-01	22927
2004-10-01	27349
2005-01-01	26946
2005-04-01	26832
2005-07-01	26649
2005-10-01	29369
2006-01-01	30420
2006-04-01	33066
2006-07-01	33507
2006-10-01	36175
2007-01-01	38177
2007-04-01	40876
2007-07-01	42979
2007-10-01	49307
2008-01-01	53974
2008-04-01	53498
2008-07-01	49537
2008-10-01	51460
2009-01-01	50641
2009-04-01	55422
2009-07-01	61895
2009-10-01	60795
2010-01-01	58831
2010-04-01	55349
2010-07-01	63060
2010-10-01	62048
2011-01-01	66774
2011-04-01	70030
2011-07-01	69900
2011-10-01	70427
2012-01-01	72880
2012-04-01	72466
2012-07-01	77480
2012-10-01	47835
2013-01-01	47057
2013-04-01	49009
2013-07-01	49819
2013-10-01	52932
2014-01-01	52024
2014-04-01	50994
2014-07-01	46986
2014-10-01	46087
2015-01-01	41381
2015-04-01	40900
2015-07-01	43739
2015-10-01	42304
2016-01-01	43540
2016-04-01	43245
2016-07-01	45581
2016-10-01	43232
2017-01-01	42853
2017-04-01	43832
2017-07-01	46420
2017-10-01	47442
2018-01-01	48201