Quarter	US dollars
1986-09-30	3670
1986-12-31	3518
1987-03-31	3801
1987-06-30	3350
1987-09-30	3402
1987-12-31	3554
1988-03-31	3608
1988-06-30	3215
1988-09-30	3231
1988-12-31	3001
1989-03-31	2855
1989-06-30	3232
1989-09-30	3327
1989-12-31	2988
1990-03-31	2817
1990-06-30	3447
1990-09-30	3702
1990-12-31	3960
1991-03-31	3833
1991-06-30	4134
1991-09-30	4732
1991-12-31	4780
1992-03-31	4745
1992-06-30	5321
1992-09-30	5116
1992-12-31	5503
1993-03-31	5472
1993-06-30	5384
1993-09-30	5661
1993-12-31	5664
1994-03-31	5525
1994-06-30	6577
1994-09-30	6787
1994-12-31	7419
1995-03-31	7895
1995-06-30	8196
1995-09-30	9326
1995-12-31	9682
1996-03-31	10921
1996-06-30	11433
1996-09-30	13612
1996-12-31	14661
1997-03-31	15117
1997-06-30	17158
1997-09-30	15923
1997-12-31	13671
1998-03-31	10635
1998-06-30	11228
1998-09-30	10767
1998-12-31	9724
1999-03-31	9362
1999-06-30	8383
1999-09-30	8419
1999-12-31	7823
2000-03-31	9714
2000-06-30	8595
2000-09-30	8872
2000-12-31	7997
2001-03-31	8451
2001-06-30	7987
2001-09-30	8270
2001-12-31	7422
2002-03-31	9773
2002-06-30	9026
2002-09-30	9749
2002-12-31	11052
2003-03-31	10060
2003-06-30	10404
2003-09-30	10155
2003-12-31	11998
2004-03-31	15284
2004-06-30	13703
2004-09-30	14314
2004-12-31	13501
2005-03-31	17656
2005-06-30	12354
2005-09-30	15395
2005-12-31	11251
2006-03-31	15174
2006-06-30	14628
2006-09-30	17838
2006-12-31	13532
2007-03-31	18561
2007-06-30	17136
2007-09-30	19237
2007-12-31	27272
2008-03-31	30871
2008-06-30	22118
2008-09-30	24553
2008-12-31	16380
2009-03-31	13651
2009-06-30	15143
2009-09-30	16793
2009-12-31	18315
2010-03-31	19035
2010-06-30	19865
2010-09-30	20657
2010-12-31	17493
2011-03-31	22357
2011-06-30	23709
2011-09-30	24127
2011-12-31	25580
2012-03-31	24665
2012-06-30	24234
2012-09-30	18300
2012-12-31	17152
2013-03-31	18629
2013-06-30	18422
2013-09-30	17218
2013-12-31	16644
2014-03-31	17774
2014-06-30	18887
2014-09-30	14239
2014-12-31	15239
2015-03-31	13816
2015-06-30	14405
2015-09-30	15390
2015-12-31	14686
2016-03-31	13884
2016-06-30	13110
2016-09-30	13090
2016-12-31	12262
2017-03-31	11403
2017-06-30	12145
2017-09-30	14258
2017-12-31	13690
2018-03-31	10666
2018-06-30	10011
2018-09-30	10352
2018-12-31	12999
2019-03-31	11268
2019-06-30	11729
2019-09-30	11665
2019-12-31	13267
2020-03-31	15389
2020-06-30	14073
2020-09-30	16883
2020-12-31	16779
2021-03-31	18437
2021-06-30	17782
2021-09-30	19537
2021-12-31	20781
2022-03-31	20560
2022-06-30	20657
2022-09-30	19549
2022-12-31	21087
2023-03-31	18734
2023-06-30	17486
2023-09-30	26397