Quarter	US dollars
1999-09-30	3017
1999-12-31	4390
2000-03-31	4428
2000-06-30	4382
2000-09-30	4436
2000-12-31	4165
2001-03-31	4077
2001-06-30	4093
2001-09-30	4516
2001-12-31	4140
2002-03-31	4484
2002-06-30	4350
2002-09-30	4947
2002-12-31	4817
2003-03-31	5258
2003-06-30	4955
2003-09-30	5738
2003-12-31	5697
2004-03-31	6001
2004-06-30	5780
2004-09-30	7189
2004-12-31	7305
2005-03-31	6219
2005-06-30	5953
2005-09-30	5902
2005-12-31	6166
2006-03-31	7826
2006-06-30	6708
2006-09-30	7682
2006-12-31	7644
2007-03-31	8738
2007-06-30	7717
2007-09-30	9038
2007-12-31	8041
2008-03-31	11182
2008-06-30	8217
2008-09-30	8709
2008-12-31	9448
2009-03-31	8814
2009-06-30	9211
2009-09-30	10442
2009-12-31	11102
2010-03-31	11990
2010-06-30	12824
2010-09-30	14465
2010-12-31	13684
2011-03-31	15975
2011-06-30	14449
2011-09-30	14249
2011-12-31	13408
2012-03-31	13697
2012-06-30	13098
2012-09-30	12432
2012-12-31	14042
2013-03-31	14134
2013-06-30	15188
2013-09-30	14931
2013-12-31	12593
2014-03-31	12498
2014-06-30	13360
2014-09-30	14082
2014-12-31	12034
2015-03-31	12552
2015-06-30	11910
2015-09-30	10995
2015-12-31	11421
2016-03-31	12195
2016-06-30	12156
2016-09-30	13096
2016-12-31	10588
2017-03-31	12842
2017-06-30	11118
2017-09-30	11718
2017-12-31	11874
2018-03-31	13062
2018-06-30	12200
2018-09-30	11269
2018-12-31	11068
2019-03-31	12659
2019-06-30	12629
2019-09-30	11867
2019-12-31	12242
2020-03-31	11530
2020-06-30	13328
2020-09-30	11416
2020-12-31	13129
2021-03-31	12365
2021-06-30	12057
2021-09-30	11692
2021-12-31	12976
2022-03-31	13062
2022-06-30	12372
2022-09-30	10988
2022-12-31	11724
2023-03-31	12956
2023-06-30	12194
2023-09-30	12135