Quarter	US dollars
1986-09-30	620
1986-12-31	670
1987-03-31	744
1987-06-30	707
1987-09-30	629
1987-12-31	666
1988-03-31	643
1988-06-30	565
1988-09-30	547
1988-12-31	583
1989-03-31	522
1989-06-30	497
1989-09-30	610
1989-12-31	540
1990-03-31	545
1990-06-30	568
1990-09-30	629
1990-12-31	726
1991-03-31	649
1991-06-30	702
1991-09-30	706
1991-12-31	803
1992-03-31	804
1992-06-30	773
1992-09-30	759
1992-12-31	787
1993-03-31	813
1993-06-30	687
1993-09-30	652
1993-12-31	729
1994-03-31	683
1994-06-30	712
1994-09-30	797
1994-12-31	714
1995-03-31	823
1995-06-30	1032
1995-09-30	1006
1995-12-31	1140
1996-03-31	1012
1996-06-30	1055
1996-09-30	1098
1996-12-31	1272
1997-03-31	1195
1997-06-30	1039
1997-09-30	943
1997-12-31	930
1998-03-31	979
1998-06-30	958
1998-09-30	895
1998-12-31	837
1999-03-31	763
1999-06-30	775
1999-09-30	871
1999-12-31	754
2000-03-31	605
2000-06-30	524
2000-09-30	475
2000-12-31	477
2001-03-31	455
2001-06-30	404
2001-09-30	406
2001-12-31	386
2002-03-31	360
2002-06-30	347
2002-09-30	344
2002-12-31	339
2003-03-31	441
2003-06-30	405
2003-09-30	384
2003-12-31	407
2004-03-31	468
2004-06-30	362
2004-09-30	314
2004-12-31	320
2005-03-31	361
2005-06-30	350
2005-09-30	579
2005-12-31	442
2006-03-31	823
2006-06-30	748
2006-09-30	700
2006-12-31	717
2007-03-31	667
2007-06-30	850
2007-09-30	647
2007-12-31	641
2008-03-31	584
2008-06-30	713
2008-09-30	685
2008-12-31	640
2009-03-31	683
2009-06-30	694
2009-09-30	714
2009-12-31	922
2010-03-31	690
2010-06-30	621
2010-09-30	646
2010-12-31	674
2011-03-31	712
2011-06-30	836
2011-09-30	808
2011-12-31	659
2012-03-31	555
2012-06-30	566
2012-09-30	587
2012-12-31	492
2013-03-31	559
2013-06-30	488
2013-09-30	545
2013-12-31	618
2014-03-31	709
2014-06-30	793
2014-09-30	665
2014-12-31	566
2015-03-31	589
2015-06-30	400
2015-09-30	812
2015-12-31	771
2016-03-31	800
2016-06-30	1352
2016-09-30	1409
2016-12-31	1392
2017-03-31	1505
2017-06-30	1664
2017-09-30	1998
2017-12-31	1762
2018-03-31	1105
2018-06-30	857
2018-09-30	786
2018-12-31	1061
2019-03-31	878
2019-06-30	745
2019-09-30	712
2019-12-31	1042
2020-03-31	1023
2020-06-30	1031
2020-09-30	876
2020-12-31	682
2021-03-31	740
2021-06-30	767
2021-09-30	672
2021-12-31	564
2022-03-31	482
2022-06-30	485
2022-09-30	439
2022-12-31	404
2023-03-31	375
2023-06-30	356
2023-09-30	349