Quarter	US dollars
1999-03-31	3196
1999-06-30	4613
1999-09-30	5003
1999-12-31	3959
2000-03-31	4644
2000-06-30	3194
2000-09-30	3581
2000-12-31	4000
2001-03-31	3531
2001-06-30	3656
2001-09-30	4758
2001-12-31	2799
2002-03-31	3171
2002-06-30	2698
2002-09-30	2062
2002-12-31	2487
2003-03-31	3693
2003-06-30	4265
2003-09-30	5857
2003-12-31	5224
2004-03-31	5463
2004-06-30	6300
2004-09-30	5408
2004-12-31	6552
2005-03-31	9036
2005-06-30	6239
2005-09-30	6622
2005-12-31	6764
2006-03-31	6295
2006-06-30	4592
2006-09-30	8210
2006-12-31	5658
2007-03-31	5386
2007-06-30	8643
2007-09-30	5260
2007-12-31	3669
2008-03-31	2208
2008-06-30	2288
2008-09-30	2001
2008-12-31	2760
2009-03-31	1646
2009-06-30	1878
2009-09-30	2696
2009-12-31	2330
2010-03-31	2155
2010-06-30	3705
2010-09-30	6643
2010-12-31	3758
2011-03-31	4466
2011-06-30	5007
2011-09-30	3383
2011-12-31	1693
2012-03-31	2116
2012-06-30	1863
2012-09-30	926
2012-12-31	1656
2013-03-31	1336
2013-06-30	5886
2013-09-30	8375
2013-12-31	8764
2014-03-31	8401
2014-06-30	7819
2014-09-30	8359
2014-12-31	8906
2015-03-31	8127
2015-06-30	9454
2015-09-30	7827
2015-12-31	13610
2016-03-31	849
2016-06-30	1154
2016-09-30	881
2016-12-31	999
2017-03-31	1058
2017-06-30	606
2017-09-30	1060
2017-12-31	926
2018-03-31	1443
2018-06-30	1853
2018-09-30	4581
2018-12-31	5111
2019-03-31	4055
2019-06-30	3653
2019-09-30	6525
2019-12-31	4303
2020-03-31	5158
2020-06-30	4080
2020-09-30	3741
2020-12-31	8019
2021-03-31	8348
2021-06-30	7897
2021-09-30	7196
2021-12-31	20726
2022-03-31	13822
2022-06-30	758
2022-09-30	17220
2022-12-31	18856
2023-03-31	19610
2023-06-30	17515
2023-09-30	1498