Quarter	US dollars
1999-09-30	1736
1999-12-31	2286
2000-03-31	3077
2000-06-30	3149
2000-09-30	3099
2000-12-31	3352
2001-03-31	3541
2001-06-30	4168
2001-09-30	4186
2001-12-31	4233
2002-03-31	4269
2002-06-30	4950
2002-09-30	5240
2002-12-31	6078
2003-03-31	5887
2003-06-30	6450
2003-09-30	6039
2003-12-31	6227
2004-03-31	7076
2004-06-30	6888
2004-09-30	6678
2004-12-31	7758
2005-03-31	8414
2005-06-30	8149
2005-09-30	7981
2005-12-31	7860
2006-03-31	8981
2006-06-30	13212
2006-09-30	16698
2006-12-31	15648
2007-03-31	15175
2007-06-30	18094
2007-09-30	18045
2007-12-31	20017
2008-03-31	21207
2008-06-30	19467
2008-09-30	18521
2008-12-31	11980
2009-03-31	11992
2009-06-30	13349
2009-09-30	12150
2009-12-31	12114
2010-03-31	10077
2010-06-30	10819
2010-09-30	10159
2010-12-31	10146
2011-03-31	10753
2011-06-30	9346
2011-09-30	8688
2011-12-31	9312
2012-03-31	10143
2012-06-30	9849
2012-09-30	10886
2012-12-31	10718
2013-03-31	9837
2013-06-30	9205
2013-09-30	9911
2013-12-31	9998
2014-03-31	11269
2014-06-30	10209
2014-09-30	10971
2014-12-31	15162
2015-03-31	9942
2015-06-30	9581
2015-09-30	9982
2015-12-31	9816
2016-03-31	9801
2016-06-30	9791
2016-09-30	8595
2016-12-31	8664
2017-03-31	9738
2017-06-30	9697
2017-09-30	9931
2017-12-31	8506
2018-03-31	8693
2018-06-30	8751
2018-09-30	9646
2018-12-31	10110
2019-03-31	11254
2019-06-30	10889
2019-09-30	10454
2019-12-31	11697
2020-03-31	10407
2020-06-30	9764
2020-09-30	12044
2020-12-31	11969
2021-03-31	12496
2021-06-30	13207
2021-09-30	12148
2021-12-31	12423
2022-03-31	12371
2022-06-30	11380
2022-09-30	11524
2022-12-31	11616
2023-03-31	11903
2023-06-30	11322
2023-09-30	11016