Quarter	US dollars
1986-09-30	2834
1986-12-31	2701
1987-03-31	3100
1987-06-30	4148
1987-09-30	3809
1987-12-31	5336
1988-03-31	5307
1988-06-30	5367
1988-09-30	5106
1988-12-31	5159
1989-03-31	5161
1989-06-30	4769
1989-09-30	5017
1989-12-31	4772
1990-03-31	5229
1990-06-30	5439
1990-09-30	6591
1990-12-31	7744
1991-03-31	7431
1991-06-30	6605
1991-09-30	7864
1991-12-31	6933
1992-03-31	6334
1992-06-30	9004
1992-09-30	7684
1992-12-31	8006
1993-03-31	9597
1993-06-30	8457
1993-09-30	12088
1993-12-31	9577
1994-03-31	7140
1994-06-30	7501
1994-09-30	7887
1994-12-31	7273
1995-03-31	7996
1995-06-30	7770
1995-09-30	7873
1995-12-31	11804
1996-03-31	11597
1996-06-30	10994
1996-09-30	11638
1996-12-31	11622
1997-03-31	11793
1997-06-30	10625
1997-09-30	12365
1997-12-31	14131
1998-03-31	11675
1998-06-30	15973
1998-09-30	17710
1998-12-31	12678
1999-03-31	14959
1999-06-30	15682
1999-09-30	15325
1999-12-31	11462
2000-03-31	11202
2000-06-30	13745
2000-09-30	16903
2000-12-31	13307
2001-03-31	12531
2001-06-30	12717
2001-09-30	10835
2001-12-31	10555
2002-03-31	12723
2002-06-30	14028
2002-09-30	16748
2002-12-31	15111
2003-03-31	20063
2003-06-30	24585
2003-09-30	27031
2003-12-31	27943
2004-03-31	31157
2004-06-30	32795
2004-09-30	31389
2004-12-31	37624
2005-03-31	38050
2005-06-30	36252
2005-09-30	33988
2005-12-31	33342
2006-03-31	30278
2006-06-30	30023
2006-09-30	36113
2006-12-31	32102
2007-03-31	38892
2007-06-30	42922
2007-09-30	51625
2007-12-31	52235
2008-03-31	44758
2008-06-30	44008
2008-09-30	32306
2008-12-31	44121
2009-03-31	40460
2009-06-30	33552
2009-09-30	36931
2009-12-31	26369
2010-03-31	25964
2010-06-30	22796
2010-09-30	24962
2010-12-31	19233
2011-03-31	20687
2011-06-30	22136
2011-09-30	22273
2011-12-31	20198
2012-03-31	24356
2012-06-30	29266
2012-09-30	20223
2012-12-31	19212
2013-03-31	25202
2013-06-30	24735
2013-09-30	30930
2013-12-31	31990
2014-03-31	32188
2014-06-30	23342
2014-09-30	17991
2014-12-31	17759
2015-03-31	20815
2015-06-30	17186
2015-09-30	16698
2015-12-31	16058
2016-03-31	17797
2016-06-30	16890
2016-09-30	16281
2016-12-31	17450
2017-03-31	17016
2017-06-30	15335
2017-09-30	14982
2017-12-31	15027
2018-03-31	17511
2018-06-30	12508
2018-09-30	13951
2018-12-31	10998
2019-03-31	12867
2019-06-30	11534
2019-09-30	13173
2019-12-31	11164
2020-03-31	10123
2020-06-30	11630
2020-09-30	11900
2020-12-31	10154
2021-03-31	8768
2021-06-30	8498
2021-09-30	8449
2021-12-31	11397
2022-03-31	10168
2022-06-30	10395
2022-09-30	11229
2022-12-31	12142
2023-03-31	8641
2023-06-30	10520
2023-09-30	10216