Quarter	Millions of US Dollars
1989-10-01	2553
1990-01-01	2612
1990-04-01	2840
1990-07-01	3276
1990-10-01	3941
1991-01-01	3553
1991-04-01	3658
1991-07-01	4048
1991-10-01	4200
1992-01-01	4069
1992-04-01	4674
1992-07-01	4808
1992-10-01	4131
1993-01-01	4037
1993-04-01	3895
1993-07-01	4208
1993-10-01	4133
1994-01-01	4554
1994-04-01	5231
1994-07-01	5966
1994-10-01	6049
1995-01-01	6898
1995-04-01	7245
1995-07-01	7328
1995-10-01	8006
1996-01-01	7624
1996-04-01	8104
1996-07-01	8418
1996-10-01	9102
1997-01-01	8239
1997-04-01	8396
1997-07-01	8483
1997-10-01	8457
1998-01-01	8394
1998-04-01	9916
1998-07-01	10777
1998-10-01	10951
1999-01-01	10416
1999-04-01	10674
1999-07-01	12251
1999-10-01	11726
2000-01-01	11336
2000-04-01	11660
2000-07-01	11205
2000-10-01	11335
2001-01-01	11924
2001-04-01	11625
2001-07-01	12679
2001-10-01	12737
2002-01-01	12845
2002-04-01	14473
2002-07-01	15677
2002-10-01	18321
2003-01-01	17820
2003-04-01	19074
2003-07-01	18621
2003-10-01	19993
2004-01-01	19770
2004-04-01	20490
2004-07-01	20776
2004-10-01	23348
2005-01-01	24031
2005-04-01	23533
2005-07-01	23054
2005-10-01	25891
2006-01-01	25120
2006-04-01	28170
2006-07-01	27270
2006-10-01	31671
2007-01-01	31772
2007-04-01	36002
2007-07-01	40290
2007-10-01	43664
2008-01-01	47861
2008-04-01	52826
2008-07-01	49618
2008-10-01	49087
2009-01-01	47341
2009-04-01	54238
2009-07-01	55516
2009-10-01	53008
2010-01-01	49958
2010-04-01	46607
2010-07-01	52040
2010-10-01	51858
2011-01-01	57056
2011-04-01	58961
2011-07-01	55730
2011-10-01	53309
2012-01-01	55058
2012-04-01	52971
2012-07-01	53848
2012-10-01	47173
2013-01-01	46610
2013-04-01	48811
2013-07-01	51681
2013-10-01	53356
2014-01-01	50303
2014-04-01	45787
2014-07-01	43267
2014-10-01	41428
2015-01-01	36103
2015-04-01	37044
2015-07-01	35993
2015-10-01	36899
2016-01-01	38718
2016-04-01	37879
2016-07-01	37988
2016-10-01	35539
2017-01-01	35419
2017-04-01	39024
2017-07-01	41079
2017-10-01	40810
2018-01-01	40408