Quarter	Millions of US Dollars
1989-10-01	31446
1990-01-01	33572
1990-04-01	37186
1990-07-01	41384
1990-10-01	42905
1991-01-01	38949
1991-04-01	39906
1991-07-01	48013
1991-10-01	51097
1992-01-01	52689
1992-04-01	61136
1992-07-01	62001
1992-10-01	51185
1993-01-01	51567
1993-04-01	49395
1993-07-01	48537
1993-10-01	47254
1994-01-01	50070
1994-04-01	52266
1994-07-01	57374
1994-10-01	70561
1995-01-01	79931
1995-04-01	81239
1995-07-01	78887
1995-10-01	82823
1996-01-01	81786
1996-04-01	82112
1996-07-01	83510
1996-10-01	84927
1997-01-01	80896
1997-04-01	84600
1997-07-01	82770
1997-10-01	80334
1998-01-01	83570
1998-04-01	85213
1998-07-01	90755
1998-10-01	90543
1999-01-01	84658
1999-04-01	83920
1999-07-01	91465
1999-10-01	85949
2000-01-01	84199
2000-04-01	84542
2000-07-01	79949
2000-10-01	85113
2001-01-01	82944
2001-04-01	82583
2001-07-01	91228
2001-10-01	89843
2002-01-01	89850
2002-04-01	103828
2002-07-01	106063
2002-10-01	114690
2003-01-01	122810
2003-04-01	126427
2003-07-01	131042
2003-10-01	145337
2004-01-01	141688
2004-04-01	145651
2004-07-01	148511
2004-10-01	166592
2005-01-01	160191
2005-04-01	151531
2005-07-01	156942
2005-10-01	156327
2006-01-01	159492
2006-04-01	173970
2006-07-01	174130
2006-10-01	190027
2007-01-01	193512
2007-04-01	216377
2007-07-01	231077
2007-10-01	250806
2008-01-01	276064
2008-04-01	304250
2008-07-01	283171
2008-10-01	287087
2009-01-01	294482
2009-04-01	338542
2009-07-01	351920
2009-10-01	366451
2010-01-01	353727
2010-04-01	328262
2010-07-01	381884
2010-10-01	397272
2011-01-01	437837
2011-04-01	448090
2011-07-01	417976
2011-10-01	404310
2012-01-01	410571
2012-04-01	375912
2012-07-01	386831
2012-10-01	395626
2013-01-01	381286
2013-04-01	389742
2013-07-01	395220
2013-10-01	396163
2014-01-01	389883
2014-04-01	372286
2014-07-01	340569
2014-10-01	316349
2015-01-01	283721
2015-04-01	283847
2015-07-01	284597
2015-10-01	278242
2016-01-01	292120
2016-04-01	290754
2016-07-01	295901
2016-10-01	273821
2017-01-01	279315
2017-04-01	303645
2017-07-01	314938
2017-10-01	317516
2018-01-01	329487