Quarter	US dollars
1986-09-30	1531
1986-12-31	1204
1987-03-31	1243
1987-06-30	1124
1987-09-30	1337
1987-12-31	1480
1988-03-31	1533
1988-06-30	1479
1988-09-30	1468
1988-12-31	1728
1989-03-31	1647
1989-06-30	1558
1989-09-30	1381
1989-12-31	1497
1990-03-31	1340
1990-06-30	1222
1990-09-30	1139
1990-12-31	1270
1991-03-31	1169
1991-06-30	1360
1991-09-30	1259
1991-12-31	1531
1992-03-31	1454
1992-06-30	1969
1992-09-30	2005
1992-12-31	2097
1993-03-31	2428
1993-06-30	2455
1993-09-30	2534
1993-12-31	2718
1994-03-31	3287
1994-06-30	3410
1994-09-30	3416
1994-12-31	3688
1995-03-31	3746
1995-06-30	3557
1995-09-30	3523
1995-12-31	3119
1996-03-31	3105
1996-06-30	3199
1996-09-30	3461
1996-12-31	2806
1997-03-31	3371
1997-06-30	3544
1997-09-30	3660
1997-12-31	4770
1998-03-31	4763
1998-06-30	6109
1998-09-30	6676
1998-12-31	6047
1999-03-31	6771
1999-06-30	7070
1999-09-30	8104
1999-12-31	7452
2000-03-31	6783
2000-06-30	7476
2000-09-30	7607
2000-12-31	7914
2001-03-31	6517
2001-06-30	6704
2001-09-30	6213
2001-12-31	6782
2002-03-31	7023
2002-06-30	7836
2002-09-30	7443
2002-12-31	7743
2003-03-31	8262
2003-06-30	7555
2003-09-30	6573
2003-12-31	8403
2004-03-31	9434
2004-06-30	7230
2004-09-30	8001
2004-12-31	7691
2005-03-31	7929
2005-06-30	6599
2005-09-30	8738
2005-12-31	7982
2006-03-31	8098
2006-06-30	7229
2006-09-30	6386
2006-12-31	7393
2007-03-31	7652
2007-06-30	10818
2007-09-30	13723
2007-12-31	18565
2008-03-31	20801
2008-06-30	18358
2008-09-30	20052
2008-12-31	16744
2009-03-31	18022
2009-06-30	18112
2009-09-30	18045
2009-12-31	17068
2010-03-31	17306
2010-06-30	17300
2010-09-30	15717
2010-12-31	19439
2011-03-31	17905
2011-06-30	18398
2011-09-30	16633
2011-12-31	15832
2012-03-31	15330
2012-06-30	15467
2012-09-30	14305
2012-12-31	13030
2013-03-31	11444
2013-06-30	10868
2013-09-30	12371
2013-12-31	11580
2014-03-31	16266
2014-06-30	14641
2014-09-30	17029
2014-12-31	16842
2015-03-31	17772
2015-06-30	18762
2015-09-30	21298
2015-12-31	18852
2016-03-31	21713
2016-06-30	27680
2016-09-30	30833
2016-12-31	28084
2017-03-31	25964
2017-06-30	25203
2017-09-30	30281
2017-12-31	30257
2018-03-31	32671
2018-06-30	33356
2018-09-30	29547
2018-12-31	30582
2019-03-31	31676
2019-06-30	30095
2019-09-30	28943
2019-12-31	31745
2020-03-31	33656
2020-06-30	33571
2020-09-30	27158
2020-12-31	33084
2021-03-31	29375
2021-06-30	26813
2021-09-30	27974
2021-12-31	28118
2022-03-31	30737
2022-06-30	34213
2022-09-30	29677
2022-12-31	29241
2023-03-31	22781
2023-06-30	26373
2023-09-30	24857