Quarter	US dollars
1986-09-30	1055
1986-12-31	1016
1987-03-31	1130
1987-06-30	1162
1987-09-30	997
1987-12-31	1021
1988-03-31	1191
1988-06-30	1053
1988-09-30	1044
1988-12-31	1023
1989-03-31	1133
1989-06-30	1044
1989-09-30	1134
1989-12-31	1094
1990-03-31	1274
1990-06-30	1384
1990-09-30	1635
1990-12-31	1429
1991-03-31	1394
1991-06-30	1391
1991-09-30	1416
1991-12-31	1465
1992-03-31	1491
1992-06-30	1605
1992-09-30	1815
1992-12-31	1657
1993-03-31	1605
1993-06-30	1323
1993-09-30	1260
1993-12-31	1261
1994-03-31	1737
1994-06-30	2107
1994-09-30	2623
1994-12-31	2633
1995-03-31	2295
1995-06-30	2507
1995-09-30	1966
1995-12-31	1874
1996-03-31	1727
1996-06-30	1834
1996-09-30	1471
1996-12-31	1630
1997-03-31	1608
1997-06-30	1621
1997-09-30	1578
1997-12-31	1434
1998-03-31	1395
1998-06-30	1333
1998-09-30	1488
1998-12-31	1460
1999-03-31	1625
1999-06-30	1596
1999-09-30	1635
1999-12-31	1601
2000-03-31	1530
2000-06-30	1826
2000-09-30	1556
2000-12-31	1526
2001-03-31	1739
2001-06-30	1752
2001-09-30	1919
2001-12-31	2158
2002-03-31	2603
2002-06-30	3239
2002-09-30	3576
2002-12-31	4064
2003-03-31	4615
2003-06-30	5029
2003-09-30	5139
2003-12-31	5017
2004-03-31	4957
2004-06-30	3950
2004-09-30	3937
2004-12-31	3753
2005-03-31	4109
2005-06-30	4213
2005-09-30	3873
2005-12-31	3400
2006-03-31	3747
2006-06-30	4404
2006-09-30	3988
2006-12-31	4881
2007-03-31	4147
2007-06-30	4654
2007-09-30	4885
2007-12-31	4792
2008-03-31	3792
2008-06-30	2396
2008-09-30	2334
2008-12-31	1972
2009-03-31	1949
2009-06-30	2172
2009-09-30	2192
2009-12-31	3918
2010-03-31	2702
2010-06-30	2638
2010-09-30	1986
2010-12-31	3145
2011-03-31	2934
2011-06-30	2239
2011-09-30	2668
2011-12-31	2750
2012-03-31	2166
2012-06-30	1680
2012-09-30	1306
2012-12-31	896
2013-03-31	897
2013-06-30	624
2013-09-30	547
2013-12-31	625
2014-03-31	684
2014-06-30	1010
2014-09-30	1422
2014-12-31	998
2015-03-31	1785
2015-06-30	1718
2015-09-30	1606
2015-12-31	2170
2016-03-31	2210
2016-06-30	2053
2016-09-30	2160
2016-12-31	1699
2017-03-31	1472
2017-06-30	2421
2017-09-30	1486
2017-12-31	789
2018-03-31	632
2018-06-30	641
2018-09-30	885
2018-12-31	812
2019-03-31	717
2019-06-30	748
2019-09-30	490
2019-12-31	432
2020-03-31	418
2020-06-30	413
2020-09-30	450
2020-12-31	619
2021-03-31	422
2021-06-30	736
2021-09-30	580
2021-12-31	365
2022-03-31	373
2022-06-30	483
2022-09-30	484
2022-12-31	556
2023-03-31	469
2023-06-30	445
2023-09-30	468