Quarter	US dollars
1999-09-30	3708
1999-12-31	4153
2000-03-31	5807
2000-06-30	4821
2000-09-30	5272
2000-12-31	5934
2001-03-31	5064
2001-06-30	4948
2001-09-30	4742
2001-12-31	4413
2002-03-31	4593
2002-06-30	4867
2002-09-30	5248
2002-12-31	5318
2003-03-31	5563
2003-06-30	4807
2003-09-30	6574
2003-12-31	6544
2004-03-31	8590
2004-06-30	9547
2004-09-30	10846
2004-12-31	10012
2005-03-31	13845
2005-06-30	10753
2005-09-30	11943
2005-12-31	11415
2006-03-31	14126
2006-06-30	13134
2006-09-30	13701
2006-12-31	13769
2007-03-31	16242
2007-06-30	16428
2007-09-30	17041
2007-12-31	16409
2008-03-31	15234
2008-06-30	15344
2008-09-30	14964
2008-12-31	10763
2009-03-31	10205
2009-06-30	9642
2009-09-30	13100
2009-12-31	11152
2010-03-31	13250
2010-06-30	11452
2010-09-30	16094
2010-12-31	13330
2011-03-31	14647
2011-06-30	12561
2011-09-30	17143
2011-12-31	11786
2012-03-31	16382
2012-06-30	19615
2012-09-30	19737
2012-12-31	11424
2013-03-31	9889
2013-06-30	11703
2013-09-30	13065
2013-12-31	8714
2014-03-31	6818
2014-06-30	8174
2014-09-30	7077
2014-12-31	5535
2015-03-31	8256
2015-06-30	6834
2015-09-30	7274
2015-12-31	6808
2016-03-31	7689
2016-06-30	7632
2016-09-30	6629
2016-12-31	4978
2017-03-31	5025
2017-06-30	4766
2017-09-30	3610
2017-12-31	5581
2018-03-31	7336
2018-06-30	10349
2018-09-30	5788
2018-12-31	3944
2019-03-31	5832
2019-06-30	6059
2019-09-30	5378
2019-12-31	4793
2020-03-31	5277
2020-06-30	5277
2020-09-30	5600
2020-12-31	5898
2021-03-31	5614
2021-06-30	4871
2021-09-30	5640
2021-12-31	6406
2022-03-31	10056
2022-06-30	7993
2022-09-30	7555
2022-12-31	7804
2023-03-31	9724
2023-06-30	9444
2023-09-30	9072