Quarter	US dollars
1986-09-30	7353
1986-12-31	8813
1987-03-31	8066
1987-06-30	7990
1987-09-30	7983
1987-12-31	8888
1988-03-31	8772
1988-06-30	8132
1988-09-30	8494
1988-12-31	7783
1989-03-31	7957
1989-06-30	7597
1989-09-30	8110
1989-12-31	9014
1990-03-31	9232
1990-06-30	8563
1990-09-30	9545
1990-12-31	8513
1991-03-31	8360
1991-06-30	7684
1991-09-30	8899
1991-12-31	7095
1992-03-31	7323
1992-06-30	8528
1992-09-30	8753
1992-12-31	6501
1993-03-31	6990
1993-06-30	6436
1993-09-30	7153
1993-12-31	6608
1994-03-31	7925
1994-06-30	7713
1994-09-30	8313
1994-12-31	8804
1995-03-31	9573
1995-06-30	9221
1995-09-30	9653
1995-12-31	9356
1996-03-31	10022
1996-06-30	9329
1996-09-30	10379
1996-12-31	10048
1997-03-31	11136
1997-06-30	11626
1997-09-30	12442
1997-12-31	11527
1998-03-31	14467
1998-06-30	14227
1998-09-30	15703
1998-12-31	13240
1999-03-31	15003
1999-06-30	14254
1999-09-30	14984
1999-12-31	13875
2000-03-31	15439
2000-06-30	15849
2000-09-30	15448
2000-12-31	13724
2001-03-31	15525
2001-06-30	14354
2001-09-30	16160
2001-12-31	12834
2002-03-31	14227
2002-06-30	14587
2002-09-30	15459
2002-12-31	15740
2003-03-31	18177
2003-06-30	21386
2003-09-30	16882
2003-12-31	18325
2004-03-31	22279
2004-06-30	20571
2004-09-30	19210
2004-12-31	19723
2005-03-31	21580
2005-06-30	19774
2005-09-30	22221
2005-12-31	19853
2006-03-31	21990
2006-06-30	22103
2006-09-30	21422
2006-12-31	22258
2007-03-31	24411
2007-06-30	25740
2007-09-30	27705
2007-12-31	23883
2008-03-31	21390
2008-06-30	20640
2008-09-30	16694
2008-12-31	18649
2009-03-31	18845
2009-06-30	17594
2009-09-30	16353
2009-12-31	13684
2010-03-31	14974
2010-06-30	17384
2010-09-30	20316
2010-12-31	13740
2011-03-31	17399
2011-06-30	15841
2011-09-30	18241
2011-12-31	17089
2012-03-31	19456
2012-06-30	19386
2012-09-30	21064
2012-12-31	17916
2013-03-31	19272
2013-06-30	19232
2013-09-30	18094
2013-12-31	16415
2014-03-31	20237
2014-06-30	22080
2014-09-30	17145
2014-12-31	15003
2015-03-31	15601
2015-06-30	15925
2015-09-30	16564
2015-12-31	16349
2016-03-31	15114
2016-06-30	19404
2016-09-30	20337
2016-12-31	15802
2017-03-31	16822
2017-06-30	19564
2017-09-30	19910
2017-12-31	17243
2018-03-31	19998
2018-06-30	15257
2018-09-30	12129
2018-12-31	10298
2019-03-31	10622
2019-06-30	11354
2019-09-30	9036
2019-12-31	8931
2020-03-31	9405
2020-06-30	9978
2020-09-30	14024
2020-12-31	10990
2021-03-31	9728
2021-06-30	9551
2021-09-30	9483
2021-12-31	7776
2022-03-31	8484
2022-06-30	8480
2022-09-30	7486
2022-12-31	6284
2023-03-31	6723
2023-06-30	5982
2023-09-30	7065