Quarter	Millions of US Dollars
1989-10-01	60401
1990-01-01	64056
1990-04-01	65589
1990-07-01	69965
1990-10-01	68902
1991-01-01	70268
1991-04-01	68235
1991-07-01	76951
1991-10-01	79161
1992-01-01	78345
1992-04-01	90747
1992-07-01	90133
1992-10-01	80072
1993-01-01	84073
1993-04-01	91766
1993-07-01	91301
1993-10-01	91683
1994-01-01	99028
1994-04-01	110136
1994-07-01	124624
1994-10-01	123104
1995-01-01	143755
1995-04-01	140628
1995-07-01	138427
1995-10-01	133752
1996-01-01	132053
1996-04-01	132441
1996-07-01	133295
1996-10-01	125717
1997-01-01	129192
1997-04-01	120374
1997-07-01	122945
1997-10-01	112507
1998-01-01	108158
1998-04-01	111846
1998-07-01	121591
1998-10-01	121754
1999-01-01	110275
1999-04-01	105669
1999-07-01	107158
1999-10-01	105433
2000-01-01	106760
2000-04-01	102878
2000-07-01	93625
2000-10-01	96729
2001-01-01	96203
2001-04-01	91895
2001-07-01	97678
2001-10-01	92536
2002-01-01	90997
2002-04-01	103387
2002-07-01	103285
2002-10-01	111063
2003-01-01	114234
2003-04-01	122781
2003-07-01	126333
2003-10-01	135758
2004-01-01	134074
2004-04-01	142160
2004-07-01	141933
2004-10-01	159482
2005-01-01	150170
2005-04-01	141360
2005-07-01	142976
2005-10-01	146585
2006-01-01	152382
2006-04-01	169673
2006-07-01	161983
2006-10-01	175427
2007-01-01	179176
2007-04-01	188970
2007-07-01	192046
2007-10-01	200963
2008-01-01	211252
2008-04-01	219442
2008-07-01	194577
2008-10-01	194191
2009-01-01	196954
2009-04-01	201702
2009-07-01	217965
2009-10-01	225026
2010-01-01	213767
2010-04-01	199564
2010-07-01	221797
2010-10-01	228670
2011-01-01	246066
2011-04-01	256734
2011-07-01	252133
2011-10-01	246803
2012-01-01	255628
2012-04-01	259744
2012-07-01	269242
2012-10-01	276815
2013-01-01	272054
2013-04-01	288136
2013-07-01	298154
2013-10-01	306805
2014-01-01	317586
2014-04-01	317491
2014-07-01	293197
2014-10-01	285326
2015-01-01	252898
2015-04-01	267044
2015-07-01	264966
2015-10-01	259772
2016-01-01	274306
2016-04-01	262346
2016-07-01	262319
2016-10-01	252727
2017-01-01	254696
2017-04-01	270746
2017-07-01	277030
2017-10-01	284972
2018-01-01	297893