Quarter	US dollars
1986-09-30	328
1986-12-31	372
1987-03-31	349
1987-06-30	386
1987-09-30	518
1987-12-31	678
1988-03-31	660
1988-06-30	759
1988-09-30	679
1988-12-31	816
1989-03-31	749
1989-06-30	529
1989-09-30	872
1989-12-31	861
1990-03-31	593
1990-06-30	777
1990-09-30	869
1990-12-31	878
1991-03-31	719
1991-06-30	549
1991-09-30	671
1991-12-31	745
1992-03-31	592
1992-06-30	652
1992-09-30	532
1992-12-31	460
1993-03-31	579
1993-06-30	722
1993-09-30	778
1993-12-31	725
1994-03-31	739
1994-06-30	581
1994-09-30	904
1994-12-31	606
1995-03-31	1098
1995-06-30	1022
1995-09-30	983
1995-12-31	1089
1996-03-31	1256
1996-06-30	1247
1996-09-30	1150
1996-12-31	1216
1997-03-31	1421
1997-06-30	509
1997-09-30	741
1997-12-31	409
1998-03-31	312
1998-06-30	290
1998-09-30	348
1998-12-31	246
1999-03-31	445
1999-06-30	431
1999-09-30	432
1999-12-31	282
2000-03-31	708
2000-06-30	947
2000-09-30	875
2000-12-31	856
2001-03-31	617
2001-06-30	643
2001-09-30	400
2001-12-31	437
2002-03-31	408
2002-06-30	373
2002-09-30	346
2002-12-31	411
2003-03-31	380
2003-06-30	476
2003-09-30	420
2003-12-31	394
2004-03-31	490
2004-06-30	418
2004-09-30	408
2004-12-31	554
2005-03-31	650
2005-06-30	539
2005-09-30	673
2005-12-31	866
2006-03-31	826
2006-06-30	871
2006-09-30	901
2006-12-31	1040
2007-03-31	1228
2007-06-30	1260
2007-09-30	977
2007-12-31	668
2008-03-31	922
2008-06-30	563
2008-09-30	763
2008-12-31	759
2009-03-31	386
2009-06-30	603
2009-09-30	580
2009-12-31	766
2010-03-31	684
2010-06-30	525
2010-09-30	481
2010-12-31	846
2011-03-31	642
2011-06-30	814
2011-09-30	717
2011-12-31	562
2012-03-31	501
2012-06-30	480
2012-09-30	635
2012-12-31	518
2013-03-31	404
2013-06-30	405
2013-09-30	387
2013-12-31	307
2014-03-31	350
2014-06-30	464
2014-09-30	419
2014-12-31	605
2015-03-31	765
2015-06-30	859
2015-09-30	742
2015-12-31	483
2016-03-31	475
2016-06-30	471
2016-09-30	674
2016-12-31	658
2017-03-31	524
2017-06-30	587
2017-09-30	513
2017-12-31	534
2018-03-31	703
2018-06-30	432
2018-09-30	523
2018-12-31	1320
2019-03-31	717
2019-06-30	527
2019-09-30	424
2019-12-31	463
2020-03-31	348
2020-06-30	288
2020-09-30	616
2020-12-31	475
2021-03-31	341
2021-06-30	370
2021-09-30	336
2021-12-31	257
2022-03-31	416
2022-06-30	347
2022-09-30	402
2022-12-31	392
2023-03-31	367
2023-06-30	629
2023-09-30	630