Quarter	US dollars
1999-03-31	1503
1999-06-30	1485
1999-09-30	1531
1999-12-31	1469
2000-03-31	1538
2000-06-30	1119
2000-09-30	1164
2000-12-31	968
2001-03-31	1028
2001-06-30	1020
2001-09-30	903
2001-12-31	781
2002-03-31	699
2002-06-30	542
2002-09-30	475
2002-12-31	401
2003-03-31	411
2003-06-30	634
2003-09-30	786
2003-12-31	416
2004-03-31	473
2004-06-30	331
2004-09-30	1183
2004-12-31	440
2005-03-31	481
2005-06-30	571
2005-09-30	356
2005-12-31	537
2006-03-31	974
2006-06-30	1135
2006-09-30	2057
2006-12-31	1571
2007-03-31	1795
2007-06-30	1993
2007-09-30	1371
2007-12-31	1468
2008-03-31	1569
2008-06-30	1557
2008-09-30	1796
2008-12-31	961
2009-03-31	907
2009-06-30	983
2009-09-30	1032
2009-12-31	1557
2010-03-31	1401
2010-06-30	1447
2010-09-30	3112
2010-12-31	2830
2011-03-31	4178
2011-06-30	3229
2011-09-30	2610
2011-12-31	4400
2012-03-31	3543
2012-06-30	3232
2012-09-30	2032
2012-12-31	2030
2013-03-31	2176
2013-06-30	2141
2013-09-30	2095
2013-12-31	4823
2014-03-31	3019
2014-06-30	2453
2014-09-30	1171
2014-12-31	2035
2015-03-31	1289
2015-06-30	1398
2015-09-30	1120
2015-12-31	1156
2016-03-31	661
2016-06-30	1325
2016-09-30	2176
2016-12-31	891
2017-03-31	1225
2017-06-30	898
2017-09-30	888
2017-12-31	426
2018-03-31	497
2018-06-30	753
2018-09-30	801
2018-12-31	913
2019-03-31	1963
2019-06-30	846
2019-09-30	733
2019-12-31	1490
2020-03-31	1979
2020-06-30	951
2020-09-30	822
2020-12-31	550
2021-03-31	1108
2021-06-30	1032
2021-09-30	1256
2021-12-31	1688
2022-03-31	2135
2022-06-30	3060
2022-09-30	3057
2022-12-31	1498
2023-03-31	1789
2023-06-30	3910
2023-09-30	3560