Quarter	US dollars
1986-09-30	35011
1986-12-31	36911
1987-03-31	40110
1987-06-30	39297
1987-09-30	37408
1987-12-31	46128
1988-03-31	40062
1988-06-30	33500
1988-09-30	33107
1988-12-31	34781
1989-03-31	31258
1989-06-30	32063
1989-09-30	32755
1989-12-31	33123
1990-03-31	37766
1990-06-30	39116
1990-09-30	48528
1990-12-31	49801
1991-03-31	43472
1991-06-30	40538
1991-09-30	41117
1991-12-31	39656
1992-03-31	35326
1992-06-30	38279
1992-09-30	44013
1992-12-31	36245
1993-03-31	34403
1993-06-30	29437
1993-09-30	30492
1993-12-31	33085
1994-03-31	33044
1994-06-30	37024
1994-09-30	38497
1994-12-31	38773
1995-03-31	42878
1995-06-30	45417
1995-09-30	39454
1995-12-31	38854
1996-03-31	40512
1996-06-30	38507
1996-09-30	40924
1996-12-31	40632
1997-03-31	40763
1997-06-30	41437
1997-09-30	41526
1997-12-31	40684
1998-03-31	40649
1998-06-30	40447
1998-09-30	44100
1998-12-31	41125
1999-03-31	35016
1999-06-30	30326
1999-09-30	33463
1999-12-31	30103
2000-03-31	35700
2000-06-30	34778
2000-09-30	34011
2000-12-31	40481
2001-03-31	38609
2001-06-30	37992
2001-09-30	41088
2001-12-31	42007
2002-03-31	42014
2002-06-30	44280
2002-09-30	44763
2002-12-31	47513
2003-03-31	54729
2003-06-30	50878
2003-09-30	50418
2003-12-31	48437
2004-03-31	47030
2004-06-30	49008
2004-09-30	50328
2004-12-31	50098
2005-03-31	51776
2005-06-30	52101
2005-09-30	49843
2005-12-31	50193
2006-03-31	61566
2006-06-30	61499
2006-09-30	54551
2006-12-31	59804
2007-03-31	67800
2007-06-30	73022
2007-09-30	74083
2007-12-31	78987
2008-03-31	90924
2008-06-30	82186
2008-09-30	78953
2008-12-31	70111
2009-03-31	62779
2009-06-30	61478
2009-09-30	59186
2009-12-31	60683
2010-03-31	58487
2010-06-30	56212
2010-09-30	58708
2010-12-31	58879
2011-03-31	65841
2011-06-30	64495
2011-09-30	70750
2011-12-31	101642
2012-03-31	68177
2012-06-30	71507
2012-09-30	71437
2012-12-31	65197
2013-03-31	62940
2013-06-30	62745
2013-09-30	65607
2013-12-31	65977
2014-03-31	64166
2014-06-30	61771
2014-09-30	59609
2014-12-31	53634
2015-03-31	55606
2015-06-30	42952
2015-09-30	37537
2015-12-31	37741