Quarter	US dollars
1986-09-30	23000
1986-12-31	21000
1987-03-31	23000
1987-06-30	24000
1987-09-30	26000
1987-12-31	28000
1988-03-31	28000
1988-06-30	28000
1988-09-30	29000
1988-12-31	28000
1989-03-31	27000
1989-06-30	26000
1989-09-30	27000
1989-12-31	26000
1990-03-31	32000
1990-06-30	30000
1990-09-30	36000
1990-12-31	33000
1991-03-31	36000
1991-06-30	33000
1991-09-30	34000
1991-12-31	35000
1992-03-31	38000
1992-06-30	37000
1992-09-30	48000
1992-12-31	46000
1993-03-31	49000
1993-06-30	43000
1993-09-30	50000
1993-12-31	44000
1994-03-31	47000
1994-06-30	45000
1994-09-30	47000
1994-12-31	46000
1995-03-31	54000
1995-06-30	50000
1995-09-30	45000
1995-12-31	60000
1996-03-31	70000
1996-06-30	64000
1996-09-30	70000
1996-12-31	80000
1997-03-31	88000
1997-06-30	77000
1997-09-30	87000
1997-12-31	94000
1998-03-31	95000
1998-06-30	98000
1998-09-30	117000
1998-12-31	120000
1999-03-31	128084
1999-06-30	106489
1999-09-30	119403
1999-12-31	91874
2000-03-31	108896
2000-06-30	106077
2000-09-30	97245
2000-12-31	95499
2001-03-31	135926
2001-06-30	132004
2001-09-30	126419
2001-12-31	132839
2002-03-31	139751
2002-06-30	140424
2002-09-30	132079
2002-12-31	150286
2003-03-31	158371
2003-06-30	189748
2003-09-30	201951
2003-12-31	205126
2004-03-31	235694
2004-06-30	247720
2004-09-30	243650
2004-12-31	258137
2005-03-31	298687
2005-06-30	322428
2005-09-30	269046
2005-12-31	268275
2006-03-31	255917
2006-06-30	271916
2006-09-30	283706
2006-12-31	318370
2007-03-31	323861
2007-06-30	382365
2007-09-30	390829
2007-12-31	392356
2008-03-31	409594
2008-06-30	393434
2008-09-30	354356
2008-12-31	346494
2009-03-31	342193
2009-06-30	364454
2009-09-30	351142
2009-12-31	362169
2010-03-31	374061
2010-06-30	347455
2010-09-30	394716
2010-12-31	386411
2011-03-31	379959
2011-06-30	374658
2011-09-30	322694
2011-12-31	264610
2012-03-31	257387
2012-06-30	247880
2012-09-30	248664
2012-12-31	253485
2013-03-31	243738
2013-06-30	246476
2013-09-30	253697
2013-12-31	253973
2014-03-31	259389
2014-06-30	264286
2014-09-30	242750
2014-12-31	247676
2015-03-31	245821
2015-06-30	255734
2015-09-30	270922
2015-12-31	231886
2016-03-31	225558
2016-06-30	209008
2016-09-30	217001
2016-12-31	211492
2017-03-31	215411
2017-06-30	226207
2017-09-30	219509
2017-12-31	207672
2018-03-31	197952
2018-06-30	218381
2018-09-30	220828
2018-12-31	204776
2019-03-31	207912
2019-06-30	210929
2019-09-30	203314
2019-12-31	213958
2020-03-31	220237
2020-06-30	207570
2020-09-30	198861
2020-12-31	199106
2021-03-31	182988
2021-06-30	181795
2021-09-30	181174
2021-12-31	188085
2022-03-31	177297
2022-06-30	168563
2022-09-30	152790
2022-12-31	164623
2023-03-31	166054
2023-06-30	161290
2023-09-30	157225