Quarter	US dollars
1986-09-30	1108
1986-12-31	1159
1987-03-31	1115
1987-06-30	1299
1987-09-30	1345
1987-12-31	1325
1988-03-31	1342
1988-06-30	1463
1988-09-30	1502
1988-12-31	1743
1989-03-31	1654
1989-06-30	1802
1989-09-30	2105
1989-12-31	2156
1990-03-31	2187
1990-06-30	2479
1990-09-30	2607
1990-12-31	2674
1991-03-31	2102
1991-06-30	2165
1991-09-30	2487
1991-12-31	3042
1992-03-31	2825
1992-06-30	3042
1992-09-30	2959
1992-12-31	2692
1993-03-31	2615
1993-06-30	2783
1993-09-30	2921
1993-12-31	2719
1994-03-31	2514
1994-06-30	2460
1994-09-30	2523
1994-12-31	2744
1995-03-31	2813
1995-06-30	2850
1995-09-30	2950
1995-12-31	2935
1996-03-31	2755
1996-06-30	2960
1996-09-30	3016
1996-12-31	3066
1997-03-31	2708
1997-06-30	3296
1997-09-30	3169
1997-12-31	3112
1998-03-31	2979
1998-06-30	2725
1998-09-30	2384
1998-12-31	2514
1999-03-31	2244
1999-06-30	2286
1999-09-30	2590
1999-12-31	3042
2000-03-31	2764
2000-06-30	3320
2000-09-30	3363
2000-12-31	3190
2001-03-31	3675
2001-06-30	3457
2001-09-30	3376
2001-12-31	3437
2002-03-31	3865
2002-06-30	3457
2002-09-30	3763
2002-12-31	3785
2003-03-31	3207
2003-06-30	3096
2003-09-30	3530
2003-12-31	3883
2004-03-31	4981
2004-06-30	4765
2004-09-30	5012
2004-12-31	4576
2005-03-31	4551
2005-06-30	4918
2005-09-30	5882
2005-12-31	6655
2006-03-31	5815
2006-06-30	7108
2006-09-30	7983
2006-12-31	8815
2007-03-31	7196
2007-06-30	8560
2007-09-30	9163
2007-12-31	10103
2008-03-31	8731
2008-06-30	7595
2008-09-30	9086
2008-12-31	7943
2009-03-31	8412
2009-06-30	8536
2009-09-30	7644
2009-12-31	9239
2010-03-31	8479
2010-06-30	9534
2010-09-30	11276
2010-12-31	8843
2011-03-31	10241
2011-06-30	8359
2011-09-30	8947
2011-12-31	8931
2012-03-31	8919
2012-06-30	9471
2012-09-30	8959
2012-12-31	9481
2013-03-31	8635
2013-06-30	7797
2013-09-30	7561
2013-12-31	8277
2014-03-31	8091
2014-06-30	7691
2014-09-30	7858
2014-12-31	9243
2015-03-31	7785
2015-06-30	7885
2015-09-30	7790
2015-12-31	8589
2016-03-31	7649
2016-06-30	7575
2016-09-30	7092
2016-12-31	6241
2017-03-31	6189
2017-06-30	6219
2017-09-30	6859
2017-12-31	7124
2018-03-31	6935
2018-06-30	6569
2018-09-30	6784
2018-12-31	6909
2019-03-31	5333
2019-06-30	5033
2019-09-30	4798
2019-12-31	4683
2020-03-31	4981
2020-06-30	5097
2020-09-30	5680
2020-12-31	6440
2021-03-31	6968
2021-06-30	7761
2021-09-30	6658
2021-12-31	6614
2022-03-31	6410
2022-06-30	4762
2022-09-30	4540
2022-12-31	4250
2023-03-31	6829
2023-06-30	6624
2023-09-30	6461