Quarter	US dollars
1986-09-30	1561
1986-12-31	1767
1987-03-31	2229
1987-06-30	2421
1987-09-30	2685
1987-12-31	3048
1988-03-31	2938
1988-06-30	2460
1988-09-30	2413
1988-12-31	2348
1989-03-31	2249
1989-06-30	2415
1989-09-30	3760
1989-12-31	3421
1990-03-31	3569
1990-06-30	3607
1990-09-30	3775
1990-12-31	3864
1991-03-31	3506
1991-06-30	3610
1991-09-30	3537
1991-12-31	3891
1992-03-31	3612
1992-06-30	3790
1992-09-30	3535
1992-12-31	2875
1993-03-31	2832
1993-06-30	2761
1993-09-30	2724
1993-12-31	2768
1994-03-31	2831
1994-06-30	2825
1994-09-30	2602
1994-12-31	2738
1995-03-31	2748
1995-06-30	2655
1995-09-30	2369
1995-12-31	2686
1996-03-31	2414
1996-06-30	3004
1996-09-30	2605
1996-12-31	2413
1997-03-31	3174
1997-06-30	2742
1997-09-30	2446
1997-12-31	2586
1998-03-31	2689
1998-06-30	2503
1998-09-30	2545
1998-12-31	2584
1999-03-31	2540
1999-06-30	2674
1999-09-30	2834
1999-12-31	2974
2000-03-31	3830
2000-06-30	4197
2000-09-30	4513
2000-12-31	4724
2001-03-31	4809
2001-06-30	4804
2001-09-30	4973
2001-12-31	5372
2002-03-31	5666
2002-06-30	6069
2002-09-30	7101
2002-12-31	6325
2003-03-31	7479
2003-06-30	5632
2003-09-30	5616
2003-12-31	6840
2004-03-31	6474
2004-06-30	6861
2004-09-30	6777
2004-12-31	6670
2005-03-31	6800
2005-06-30	6875
2005-09-30	6959
2005-12-31	7365
2006-03-31	9071
2006-06-30	9802
2006-09-30	10720
2006-12-31	12676
2007-03-31	11977
2007-06-30	12883
2007-09-30	14881
2007-12-31	17314
2008-03-31	16681
2008-06-30	18366
2008-09-30	17570
2008-12-31	13148
2009-03-31	12607
2009-06-30	11637
2009-09-30	12032
2009-12-31	13739
2010-03-31	15669
2010-06-30	14527
2010-09-30	13291
2010-12-31	12750
2011-03-31	11850
2011-06-30	12088
2011-09-30	12517
2011-12-31	12728
2012-03-31	15795
2012-06-30	16134
2012-09-30	13498
2012-12-31	15558
2013-03-31	14897
2013-06-30	16104
2013-09-30	14676
2013-12-31	16114
2014-03-31	14866
2014-06-30	15155
2014-09-30	14381
2014-12-31	16761
2015-03-31	12394
2015-06-30	13545
2015-09-30	11328
2015-12-31	10429
2016-03-31	10168
2016-06-30	11204
2016-09-30	11784
2016-12-31	11531
2017-03-31	14398
2017-06-30	14531
2017-09-30	15758
2017-12-31	17982
2018-03-31	23679
2018-06-30	22857
2018-09-30	22976
2018-12-31	22841
2019-03-31	23347
2019-06-30	23700
2019-09-30	19789
2019-12-31	14990
2020-03-31	14360
2020-06-30	14658
2020-09-30	14038
2020-12-31	15865
2021-03-31	18225
2021-06-30	18023
2021-09-30	18918
2021-12-31	19948
2022-03-31	19830
2022-06-30	21566
2022-09-30	20779
2022-12-31	20126
2023-03-31	18341
2023-06-30	15559
2023-09-30	16174