Quarter	US dollars
1999-03-31	2229
1999-06-30	2146
1999-09-30	2088
1999-12-31	2505
2000-03-31	2341
2000-06-30	2495
2000-09-30	2056
2000-12-31	2330
2001-03-31	1709
2001-06-30	1687
2001-09-30	3132
2001-12-31	1763
2002-03-31	2182
2002-06-30	2373
2002-09-30	2270
2002-12-31	2421
2003-03-31	3040
2003-06-30	5203
2003-09-30	3221
2003-12-31	3430
2004-03-31	4942
2004-06-30	3505
2004-09-30	4284
2004-12-31	4458
2005-03-31	4103
2005-06-30	2968
2005-09-30	3454
2005-12-31	4580
2006-03-31	5427
2006-06-30	5073
2006-09-30	5117
2006-12-31	4479
2007-03-31	7667
2007-06-30	7810
2007-09-30	7467
2007-12-31	5359
2008-03-31	5926
2008-06-30	5722
2008-09-30	4576
2008-12-31	4527
2009-03-31	3614
2009-06-30	3800
2009-09-30	3505
2009-12-31	3299
2010-03-31	3806
2010-06-30	4571
2010-09-30	6671
2010-12-31	2970
2011-03-31	5149
2011-06-30	6173
2011-09-30	4277
2011-12-31	4998
2012-03-31	9029
2012-06-30	9793
2012-09-30	10828
2012-12-31	10006
2013-03-31	10490
2013-06-30	11182
2013-09-30	10079
2013-12-31	9594
2014-03-31	10345
2014-06-30	11801
2014-09-30	8030
2014-12-31	6971
2015-03-31	7004
2015-06-30	7517
2015-09-30	6465
2015-12-31	7241
2016-03-31	7109
2016-06-30	9141
2016-09-30	10411
2016-12-31	8919
2017-03-31	8761
2017-06-30	11825
2017-09-30	13318
2017-12-31	10852
2018-03-31	11293
2018-06-30	8459
2018-09-30	6056
2018-12-31	5342
2019-03-31	5604
2019-06-30	6159
2019-09-30	3732
2019-12-31	4204
2020-03-31	5115
2020-06-30	5833
2020-09-30	8669
2020-12-31	5918
2021-03-31	3761
2021-06-30	3816
2021-09-30	3946
2021-12-31	3395
2022-03-31	4291
2022-06-30	4078
2022-09-30	2792
2022-12-31	2755
2023-03-31	2891
2023-06-30	2854
2023-09-30	3636