Quarter	US dollars
1986-09-30	11444
1986-12-31	12914
1987-03-31	13097
1987-06-30	13991
1987-09-30	15032
1987-12-31	17094
1988-03-31	17583
1988-06-30	18752
1988-09-30	18901
1988-12-31	21455
1989-03-31	21273
1989-06-30	22132
1989-09-30	24123
1989-12-31	25644
1990-03-31	31169
1990-06-30	33169
1990-09-30	38326
1990-12-31	37321
1991-03-31	36865
1991-06-30	37685
1991-09-30	40238
1991-12-31	35024
1992-03-31	34168
1992-06-30	38924
1992-09-30	43295
1992-12-31	35743
1993-03-31	39845
1993-06-30	36773
1993-09-30	36626
1993-12-31	35500
1994-03-31	40336
1994-06-30	41256
1994-09-30	43568
1994-12-31	40477
1995-03-31	41506
1995-06-30	40860
1995-09-30	42442
1995-12-31	49538
1996-03-31	61918
1996-06-30	61460
1996-09-30	64678
1996-12-31	62178
1997-03-31	68211
1997-06-30	67129
1997-09-30	81941
1997-12-31	78444
1998-03-31	90509
1998-06-30	97307
1998-09-30	112986
1998-12-31	90560
1999-03-31	20046
1999-06-30	18443
1999-09-30	17576
1999-12-31	16242
2000-03-31	17877
2000-06-30	19244
2000-09-30	20909
2000-12-31	19554
2001-03-31	18598
2001-06-30	23313
2001-09-30	21490
2001-12-31	20971
2002-03-31	22868
2002-06-30	24260
2002-09-30	25996
2002-12-31	29370
2003-03-31	28598
2003-06-30	30673
2003-09-30	33164
2003-12-31	36452
2004-03-31	40888
2004-06-30	39584
2004-09-30	43566
2004-12-31	47109
2005-03-31	46778
2005-06-30	52783
2005-09-30	59208
2005-12-31	55858
2006-03-31	67421
2006-06-30	70000
2006-09-30	69857
2006-12-31	70165
2007-03-31	78229
2007-06-30	80721
2007-09-30	88924
2007-12-31	91243
2008-03-31	93051
2008-06-30	92785
2008-09-30	87901
2008-12-31	69801
2009-03-31	72144
2009-06-30	75973
2009-09-30	91260
2009-12-31	91339
2010-03-31	94955
2010-06-30	82633
2010-09-30	88855
2010-12-31	86376
2011-03-31	99947
2011-06-30	104245
2011-09-30	93303
2011-12-31	87049
2012-03-31	87109
2012-06-30	86889
2012-09-30	92002
2012-12-31	91522
2013-03-31	91711
2013-06-30	94423
2013-09-30	95467
2013-12-31	89072
2014-03-31	91880
2014-06-30	95483
2014-09-30	94189
2014-12-31	85160
2015-03-31	81106
2015-06-30	85025
2015-09-30	85933
2015-12-31	77590