Quarter	US dollars
1986-09-30	44121
1986-12-31	64142
1987-03-31	62998
1987-06-30	61401
1987-09-30	61517
1987-12-31	63452
1988-03-31	62975
1988-06-30	57443
1988-09-30	56513
1988-12-31	58516
1989-03-31	59624
1989-06-30	53136
1989-09-30	58161
1989-12-31	61940
1990-03-31	63249
1990-06-30	65527
1990-09-30	76714
1990-12-31	84047
1991-03-31	85602
1991-06-30	83160
1991-09-30	83369
1991-12-31	86077
1992-03-31	73368
1992-06-30	71633
1992-09-30	74366
1992-12-31	50055
1993-03-31	50441
1993-06-30	59787
1993-09-30	60573
1993-12-31	62007
1994-03-31	63916
1994-06-30	66120
1994-09-30	72371
1994-12-31	75603
1995-03-31	121504
1995-06-30	122453
1995-09-30	121078
1995-12-31	111752
1996-03-31	118328
1996-06-30	118706
1996-09-30	125053
1996-12-31	131768
1997-03-31	137122
1997-06-30	138353
1997-09-30	71654
1997-12-31	62602
1998-03-31	68036
1998-06-30	64171
1998-09-30	64653
1998-12-31	63353
1999-03-31	63519
1999-06-30	64697
1999-09-30	67261
1999-12-31	67622
2000-03-31	65970
2000-06-30	72735
2000-09-30	73294
2000-12-31	79222
2001-03-31	81400
2001-06-30	85995
2001-09-30	91688
2001-12-31	92778
2002-03-31	92529
2002-06-30	104042
2002-09-30	120234
2002-12-31	129109
2003-03-31	131408
2003-06-30	134851
2003-09-30	150260
2003-12-31	167525
2004-03-31	172335
2004-06-30	185181
2004-09-30	196872
2004-12-31	215570
2005-03-31	214865
2005-06-30	219133
2005-09-30	222515
2005-12-31	229924
2006-03-31	248330
2006-06-30	272860
2006-09-30	282596
2006-12-31	282096
2007-03-31	309081
2007-06-30	337442
2007-09-30	361351
2007-12-31	399801
2008-03-31	427256
2008-06-30	445998
2008-09-30	429859
2008-12-31	423076
2009-03-31	410487
2009-06-30	429006
2009-09-30	469654
2009-12-31	486599
2010-03-31	490437
2010-06-30	469224
2010-09-30	518712
2010-12-31	523847
2011-03-31	552384
2011-06-30	570110
2011-09-30	527844
2011-12-31	553156
2012-03-31	561380
2012-06-30	542936
2012-09-30	540732
2012-12-31	537680
2013-03-31	506998
2013-06-30	483239
2013-09-30	504671
2013-12-31	502920
2014-03-31	490710
2014-06-30	511992
2014-09-30	493671
2014-12-31	463743
2015-03-31	464267
2015-06-30	478174
2015-09-30	459174
2015-12-31	455816