Quarter	US dollars
1986-09-30	7459
1986-12-31	8225
1987-03-31	7736
1987-06-30	8698
1987-09-30	7539
1987-12-31	6237
1988-03-31	4823
1988-06-30	4271
1988-09-30	3897
1988-12-31	3780
1989-03-31	3332
1989-06-30	2980
1989-09-30	2919
1989-12-31	3179
1990-03-31	3150
1990-06-30	2966
1990-09-30	2973
1990-12-31	2955
1991-03-31	2454
1991-06-30	2441
1991-09-30	2382
1991-12-31	2590
1992-03-31	2577
1992-06-30	2571
1992-09-30	2578
1992-12-31	2543
1993-03-31	2584
1993-06-30	2609
1993-09-30	2474
1993-12-31	2415
1994-03-31	2513
1994-06-30	2712
1994-09-30	2745
1994-12-31	2813
1995-03-31	2611
1995-06-30	2505
1995-09-30	2592
1995-12-31	2461
1996-03-31	2802
1996-06-30	3037
1996-09-30	3167
1996-12-31	2715
1997-03-31	2249
1997-06-30	2157
1997-09-30	2148
1997-12-31	1883
1998-03-31	1824
1998-06-30	1903
1998-09-30	1946
1998-12-31	2054
1999-03-31	2021
1999-06-30	2035
1999-09-30	2168
1999-12-31	2153
2000-03-31	2068
2000-06-30	2249
2000-09-30	2450
2000-12-31	2346
2001-03-31	2228
2001-06-30	2317
2001-09-30	2209
2001-12-31	2179
2002-03-31	1869
2002-06-30	1801
2002-09-30	1818
2002-12-31	1805
2003-03-31	1627
2003-06-30	1620
2003-09-30	1651
2003-12-31	1661
2004-03-31	1591
2004-06-30	1516
2004-09-30	1488
2004-12-31	1705
2005-03-31	1505
2005-06-30	1507
2005-09-30	1629
2005-12-31	1517
2006-03-31	1479
2006-06-30	1708
2006-09-30	1783
2006-12-31	1818
2007-03-31	1875
2007-06-30	2221
2007-09-30	2567
2007-12-31	2619
2008-03-31	2407
2008-06-30	2632
2008-09-30	2666
2008-12-31	2773
2009-03-31	2665
2009-06-30	2708
2009-09-30	2717
2009-12-31	2734
2010-03-31	3070
2010-06-30	3457
2010-09-30	3766
2010-12-31	3974
2011-03-31	4146
2011-06-30	3844
2011-09-30	3559
2011-12-31	3382
2012-03-31	3172
2012-06-30	2932
2012-09-30	2558
2012-12-31	2656
2013-03-31	3021
2013-06-30	3012
2013-09-30	3137
2013-12-31	3752
2014-03-31	3554
2014-06-30	3671
2014-09-30	3715
2014-12-31	3748
2015-03-31	3520
2015-06-30	3749
2015-09-30	3938
2015-12-31	3714
2016-03-31	3219
2016-06-30	3041
2016-09-30	2885
2016-12-31	2443
2017-03-31	2375
2017-06-30	2071
2017-09-30	2169
2017-12-31	2506
2018-03-31	2153
2018-06-30	2046
2018-09-30	2028
2018-12-31	2012
2019-03-31	1774
2019-06-30	1761
2019-09-30	1775
2019-12-31	1882
2020-03-31	2103
2020-06-30	2306
2020-09-30	2167
2020-12-31	2307
2021-03-31	1940
2021-06-30	2345
2021-09-30	1991
2021-12-31	2287
2022-03-31	1840
2022-06-30	1946
2022-09-30	2349
2022-12-31	2329
2023-03-31	2162
2023-06-30	1794
2023-09-30	2032