Quarter	Millions of US Dollars
1989-01-01	60717
1989-04-01	61441
1989-07-01	64642
1989-10-01	66732
1990-01-01	67236
1990-04-01	71125
1990-07-01	72529
1990-10-01	67913
1991-01-01	66773
1991-04-01	63935
1991-07-01	65823
1991-10-01	61668
1992-01-01	51831
1992-04-01	54415
1992-07-01	50741
1992-10-01	42982
1993-01-01	42490
1993-04-01	46560
1993-07-01	47197
1993-10-01	50910
1994-01-01	49155
1994-04-01	50035
1994-07-01	52791
1994-10-01	49866
1995-01-01	53867
1995-04-01	56657
1995-07-01	59710
1995-10-01	59903
1996-01-01	62195
1996-04-01	65050
1996-07-01	67712
1996-10-01	71589
1997-01-01	79250
1997-04-01	85197
1997-07-01	91245
1997-10-01	93742
1998-01-01	100911
1998-04-01	107875
1998-07-01	108540
1998-10-01	109705
1999-01-01	120639
1999-04-01	127585
1999-07-01	130740
1999-10-01	138657
2000-01-01	145839
2000-04-01	147601
2000-07-01	148248
2000-10-01	151545
2001-01-01	145601
2001-04-01	148076
2001-07-01	143871
2001-10-01	142948
2002-01-01	140640
2002-04-01	150517
2002-07-01	143457
2002-10-01	143223
2003-01-01	156644
2003-04-01	169005
2003-07-01	171684
2003-10-01	181637
2004-01-01	182058
2004-04-01	181928
2004-07-01	196373
2004-10-01	215349
2005-01-01	223339
2005-04-01	224729
2005-07-01	245795
2005-10-01	256015
2006-01-01	273741
2006-04-01	295156
2006-07-01	300973
2006-10-01	303401
2007-01-01	309412
2007-04-01	348719
2007-07-01	351165
2007-10-01	344989
2008-01-01	334427
2008-04-01	327559
2008-07-01	304665
2008-10-01	252650
2009-01-01	238537
2009-04-01	251036
2009-07-01	260290
2009-10-01	251553
2010-01-01	261458
2010-04-01	258110
2010-07-01	259032
2010-10-01	273188
2011-01-01	284970
2011-04-01	285447
2011-07-01	267713
2011-10-01	274327
2012-01-01	302917
2012-04-01	295356
2012-07-01	310889
2012-10-01	308407
2013-01-01	312291
2013-04-01	307961
2013-07-01	323633
2013-10-01	316345
2014-01-01	316310
2014-04-01	333991
2014-07-01	325860
2014-10-01	312884
2015-01-01	293624
2015-04-01	307293
2015-07-01	281025
2015-10-01	274462
2016-01-01	295438
2016-04-01	304208
2016-07-01	308675
2016-10-01	292513
2017-01-01	296287
2017-04-01	307307
2017-07-01	325889
2017-10-01	320385
2018-01-01	312895