Quarter	US dollars
1986-09-30	22000
1986-12-31	26000
1987-03-31	27000
1987-06-30	30000
1987-09-30	31000
1987-12-31	38000
1988-03-31	37000
1988-06-30	38000
1988-09-30	39000
1988-12-31	45000
1989-03-31	45000
1989-06-30	48000
1989-09-30	48000
1989-12-31	55000
1990-03-31	55000
1990-06-30	63000
1990-09-30	73000
1990-12-31	78000
1991-03-31	80000
1991-06-30	71000
1991-09-30	74000
1991-12-31	80000
1992-03-31	76000
1992-06-30	81000
1992-09-30	88000
1992-12-31	80000
1993-03-31	77000
1993-06-30	74000
1993-09-30	72000
1993-12-31	69000
1994-03-31	70000
1994-06-30	72000
1994-09-30	71000
1994-12-31	71000
1995-03-31	72000
1995-06-30	70000
1995-09-30	70000
1995-12-31	72000
1996-03-31	72000
1996-06-30	74000
1996-09-30	75000
1996-12-31	77000
1997-03-31	73000
1997-06-30	75000
1997-09-30	73000
1997-12-31	82000
1998-03-31	80000
1998-06-30	82000
1998-09-30	81000
1998-12-31	84000
1999-03-31	77397
1999-06-30	74212
1999-09-30	74800
1999-12-31	71312
2000-03-31	71608
2000-06-30	75918
2000-09-30	68828
2000-12-31	72906
2001-03-31	78233
2001-06-30	77112
2001-09-30	75464
2001-12-31	74670
2002-03-31	65408
2002-06-30	66637
2002-09-30	60286
2002-12-31	64293
2003-03-31	63645
2003-06-30	71518
2003-09-30	70414
2003-12-31	80446
2004-03-31	74254
2004-06-30	68131
2004-09-30	66529
2004-12-31	78311
2005-03-31	64116
2005-06-30	61924
2005-09-30	64771
2005-12-31	91394
2006-03-31	93462
2006-06-30	103963
2006-09-30	106822
2006-12-31	107035
2007-03-31	117579
2007-06-30	118607
2007-09-30	129830
2007-12-31	135174
2008-03-31	137298
2008-06-30	150639
2008-09-30	142227
2008-12-31	118430
2009-03-31	121471
2009-06-30	139136
2009-09-30	123801
2009-12-31	114712
2010-03-31	104458
2010-06-30	94802
2010-09-30	105530
2010-12-31	105639
2011-03-31	111511
2011-06-30	112144
2011-09-30	73016
2011-12-31	53245
2012-03-31	64299
2012-06-30	53129
2012-09-30	52344
2012-12-31	58863
2013-03-31	53824
2013-06-30	47822
2013-09-30	47330
2013-12-31	42189
2014-03-31	47486
2014-06-30	47468
2014-09-30	42002
2014-12-31	35078
2015-03-31	30000
2015-06-30	29201
2015-09-30	27742
2015-12-31	28579
2016-03-31	31772
2016-06-30	31041
2016-09-30	29609
2016-12-31	34305
2017-03-31	28146
2017-06-30	30386
2017-09-30	32261
2017-12-31	36214
2018-03-31	32082
2018-06-30	28943
2018-09-30	26975
2018-12-31	24499
2019-03-31	26839
2019-06-30	27417
2019-09-30	28397
2019-12-31	30235
2020-03-31	29204
2020-06-30	31483
2020-09-30	31983
2020-12-31	34230
2021-03-31	26913
2021-06-30	24799
2021-09-30	23791
2021-12-31	23169
2022-03-31	18263
2022-06-30	13803
2022-09-30	8565
2022-12-31	3306
2023-03-31	2940
2023-06-30	2968
2023-09-30	2900