Quarter	Millions of US Dollars
1990-01-01	8522
1990-04-01	8669
1990-07-01	8934
1990-10-01	8343
1991-01-01	8140
1991-04-01	8295
1991-07-01	8716
1991-10-01	8420
1992-01-01	9177
1992-04-01	9913
1992-07-01	10563
1992-10-01	10813
1993-01-01	11060
1993-04-01	11008
1993-07-01	11914
1993-10-01	12088
1994-01-01	12234
1994-04-01	12893
1994-07-01	12657
1994-10-01	14008
1995-01-01	14582
1995-04-01	13646
1995-07-01	14349
1995-10-01	15097
1996-01-01	16025
1996-04-01	14643
1996-07-01	15084
1996-10-01	15703
1997-01-01	13911
1997-04-01	14012
1997-07-01	13967
1997-10-01	13017
1998-01-01	11148
1998-04-01	10623
1998-07-01	11320
1998-10-01	12640
1999-01-01	13152
1999-04-01	13516
1999-07-01	11561
1999-10-01	11764
2000-01-01	12083
2000-04-01	11878
2000-07-01	9026
2000-10-01	10250
2001-01-01	10114
2001-04-01	10695
2001-07-01	9945
2001-10-01	10521
2002-01-01	11736
2002-04-01	13558
2002-07-01	13403
2002-10-01	13450
2003-01-01	14348
2003-04-01	15941
2003-07-01	16766
2003-10-01	16703
2004-01-01	17103
2004-04-01	16820
2004-07-01	16372
2004-10-01	18000
2005-01-01	18912
2005-04-01	18999
2005-07-01	16807
2005-10-01	17127
2006-01-01	16532
2006-04-01	14637
2006-07-01	16137
2006-10-01	18208
2007-01-01	18815
2007-04-01	20762
2007-07-01	20811
2007-10-01	21683
2008-01-01	19437
2008-04-01	19047
2008-07-01	18170
2008-10-01	16119
2009-01-01	13534
2009-04-01	16833
2009-07-01	22394
2009-10-01	24446
2010-01-01	25660
2010-04-01	26825
2010-07-01	31756
2010-10-01	36840
2011-01-01	39772
2011-04-01	40422
2011-07-01	39492
2011-10-01	43371
2012-01-01	47782
2012-04-01	49364
2012-07-01	54011
2012-10-01	48943
2013-01-01	51478
2013-04-01	50808
2013-07-01	55557
2013-10-01	58868
2014-01-01	62287
2014-04-01	62421
2014-07-01	56789
2014-10-01	53484
2015-01-01	51636
2015-04-01	47612
2015-07-01	44494
2015-10-01	49959
2016-01-01	51111
2016-04-01	54303
2016-07-01	56454
2016-10-01	47381
2017-01-01	49528
2017-04-01	52816
2017-07-01	52832
2017-10-01	53154
2018-01-01	47595