Quarter	US dollars
1999-03-31	558
1999-06-30	773
1999-09-30	435
1999-12-31	450
2000-03-31	449
2000-06-30	378
2000-09-30	447
2000-12-31	341
2001-03-31	291
2001-06-30	333
2001-09-30	336
2001-12-31	339
2002-03-31	352
2002-06-30	393
2002-09-30	422
2002-12-31	352
2003-03-31	345
2003-06-30	345
2003-09-30	258
2003-12-31	326
2004-03-31	361
2004-06-30	304
2004-09-30	432
2004-12-31	392
2005-03-31	596
2005-06-30	544
2005-09-30	738
2005-12-31	601
2006-03-31	660
2006-06-30	934
2006-09-30	569
2006-12-31	600
2007-03-31	644
2007-06-30	681
2007-09-30	700
2007-12-31	928
2008-03-31	775
2008-06-30	784
2008-09-30	717
2008-12-31	491
2009-03-31	514
2009-06-30	537
2009-09-30	1042
2009-12-31	1015
2010-03-31	1741
2010-06-30	1687
2010-09-30	1868
2010-12-31	1638
2011-03-31	1892
2011-06-30	1930
2011-09-30	1598
2011-12-31	1060
2012-03-31	1121
2012-06-30	1074
2012-09-30	1228
2012-12-31	1487
2013-03-31	1306
2013-06-30	1449
2013-09-30	1474
2013-12-31	1429
2014-03-31	1245
2014-06-30	1403
2014-09-30	1644
2014-12-31	1817
2015-03-31	1734
2015-06-30	1672
2015-09-30	1872
2015-12-31	2176
2016-03-31	1493
2016-06-30	1650
2016-09-30	1750
2016-12-31	1959
2017-03-31	2065
2017-06-30	2023
2017-09-30	1885
2017-12-31	1937
2018-03-31	1212
2018-06-30	2921
2018-09-30	1735
2018-12-31	1241
2019-03-31	1115
2019-06-30	1198
2019-09-30	1246
2019-12-31	922
2020-03-31	994
2020-06-30	959
2020-09-30	878
2020-12-31	1090
2021-03-31	1020
2021-06-30	1101
2021-09-30	949
2021-12-31	968
2022-03-31	912
2022-06-30	966
2022-09-30	876
2022-12-31	837
2023-03-31	832
2023-06-30	931
2023-09-30	922