Quarter	US dollars
1986-09-30	20666
1986-12-31	21870
1987-03-31	26791
1987-06-30	27453
1987-09-30	31897
1987-12-31	37197
1988-03-31	40130
1988-06-30	44034
1988-09-30	47014
1988-12-31	44726
1989-03-31	38361
1989-06-30	41263
1989-09-30	41193
1989-12-31	41509
1990-03-31	44164
1990-06-30	49856
1990-09-30	55086
1990-12-31	57761
1991-03-31	51377
1991-06-30	42131
1991-09-30	42483
1991-12-31	45361
1992-03-31	43066
1992-06-30	53399
1992-09-30	67391
1992-12-31	52467
1993-03-31	50167
1993-06-30	50072
1993-09-30	48722
1993-12-31	56066
1994-03-31	55289
1994-06-30	54954
1994-09-30	61193
1994-12-31	68861
1995-03-31	70774
1995-06-30	78015
1995-09-30	72720
1995-12-31	73917
1996-03-31	75214
1996-06-30	73398
1996-09-30	81481
1996-12-31	97189
1997-03-31	107016
1997-06-30	120311
1997-09-30	118268
1997-12-31	139485
1998-03-31	146683
1998-06-30	141786
1998-09-30	155084
1998-12-31	159167
1999-03-31	155662
1999-06-30	144426
1999-09-30	150426
1999-12-31	137616
2000-03-31	162886
2000-06-30	159221
2000-09-30	164021
2000-12-31	161237
2001-03-31	170176
2001-06-30	148173
2001-09-30	176266
2001-12-31	172697
2002-03-31	165252
2002-06-30	173003
2002-09-30	172125
2002-12-31	179747
2003-03-31	176073
2003-06-30	198431
2003-09-30	199567
2003-12-31	230773
2004-03-31	283309
2004-06-30	277969
2004-09-30	229322
2004-12-31	236563
2005-03-31	263944
2005-06-30	255608
2005-09-30	258876
2005-12-31	283945
2006-03-31	304769
2006-06-30	360478
2006-09-30	346835
2006-12-31	412134
2007-03-31	578364
2007-06-30	585441
2007-09-30	590143
2007-12-31	646388
2008-03-31	665028
2008-06-30	570335
2008-09-30	508729
2008-12-31	438596
2009-03-31	456756
2009-06-30	481146
2009-09-30	371596
2009-12-31	363448
2010-03-31	353419
2010-06-30	353218
2010-09-30	357099
2010-12-31	313268
2011-03-31	278637
2011-06-30	282339
2011-09-30	272608
2011-12-31	233586
2012-03-31	248128
2012-06-30	238490
2012-09-30	249695
2012-12-31	240222
2013-03-31	207307
2013-06-30	219879
2013-09-30	228202
2013-12-31	219862
2014-03-31	214981
2014-06-30	212483
2014-09-30	206528
2014-12-31	194544
2015-03-31	194492
2015-06-30	213290
2015-09-30	214224
2015-12-31	196767