Quarter	US dollars
1986-09-30	3556
1986-12-31	3688
1987-03-31	3748
1987-06-30	3933
1987-09-30	3641
1987-12-31	4280
1988-03-31	3911
1988-06-30	4180
1988-09-30	4423
1988-12-31	4315
1989-03-31	4317
1989-06-30	4506
1989-09-30	4294
1989-12-31	4514
1990-03-31	4521
1990-06-30	5259
1990-09-30	6851
1990-12-31	7161
1991-03-31	7663
1991-06-30	8119
1991-09-30	8473
1991-12-31	9282
1992-03-31	9477
1992-06-30	10212
1992-09-30	10925
1992-12-31	10886
1993-03-31	10720
1993-06-30	10841
1993-09-30	12246
1993-12-31	13569
1994-03-31	14215
1994-06-30	14279
1994-09-30	13918
1994-12-31	13873
1995-03-31	14403
1995-06-30	14318
1995-09-30	14097
1995-12-31	13188
1996-03-31	12397
1996-06-30	12017
1996-09-30	11726
1996-12-31	11942
1997-03-31	12401
1997-06-30	12629
1997-09-30	12108
1997-12-31	11423
1998-03-31	11146
1998-06-30	10959
1998-09-30	10050
1998-12-31	9796
1999-03-31	8748
1999-06-30	8664
1999-09-30	8419
1999-12-31	8148
2000-03-31	8225
2000-06-30	8358
2000-09-30	8304
2000-12-31	8141
2001-03-31	8128
2001-06-30	7811
2001-09-30	7748
2001-12-31	7464
2002-03-31	7306
2002-06-30	7618
2002-09-30	7336
2002-12-31	7766
2003-03-31	7968
2003-06-30	8444
2003-09-30	8677
2003-12-31	8850
2004-03-31	8745
2004-06-30	9233
2004-09-30	9017
2004-12-31	9512
2005-03-31	10280
2005-06-30	11994
2005-09-30	14540
2005-12-31	14584
2006-03-31	14390
2006-06-30	12551
2006-09-30	13752
2006-12-31	14494
2007-03-31	12554
2007-06-30	13061
2007-09-30	12988
2007-12-31	11895
2008-03-31	13062
2008-06-30	10529
2008-09-30	8535
2008-12-31	8342
2009-03-31	6744
2009-06-30	6923
2009-09-30	7704
2009-12-31	7238
2010-03-31	9041
2010-06-30	6416
2010-09-30	6757
2010-12-31	6628
2011-03-31	8161
2011-06-30	8232
2011-09-30	7154
2011-12-31	6915
2012-03-31	6748
2012-06-30	6419
2012-09-30	6108
2012-12-31	6024
2013-03-31	5857
2013-06-30	5444
2013-09-30	5714
2013-12-31	5435
2014-03-31	6016
2014-06-30	5980
2014-09-30	5874
2014-12-31	6268
2015-03-31	4572
2015-06-30	4484
2015-09-30	4752
2015-12-31	4490
2016-03-31	4706
2016-06-30	4673
2016-09-30	6039
2016-12-31	6064
2017-03-31	6153
2017-06-30	6992
2017-09-30	5835
2017-12-31	6022
2018-03-31	5627
2018-06-30	5537
2018-09-30	5503
2018-12-31	5611
2019-03-31	5574
2019-06-30	5641
2019-09-30	5107
2019-12-31	5182
2020-03-31	4789
2020-06-30	4898
2020-09-30	4931
2020-12-31	4203
2021-03-31	4358
2021-06-30	4875
2021-09-30	4338
2021-12-31	4054
2022-03-31	5257
2022-06-30	5954
2022-09-30	5501
2022-12-31	4805
2023-03-31	6052
2023-06-30	4700
2023-09-30	4540