Quarterly 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