Quarter	US dollars
1999-09-30	1248
1999-12-31	1291
2000-03-31	2015
2000-06-30	2326
2000-09-30	2152
2000-12-31	2736
2001-03-31	2322
2001-06-30	2429
2001-09-30	2370
2001-12-31	2346
2002-03-31	2293
2002-06-30	2597
2002-09-30	2944
2002-12-31	2836
2003-03-31	2701
2003-06-30	3094
2003-09-30	3187
2003-12-31	3907
2004-03-31	2955
2004-06-30	4046
2004-09-30	4695
2004-12-31	3838
2005-03-31	5896
2005-06-30	4619
2005-09-30	4861
2005-12-31	5321
2006-03-31	6485
2006-06-30	5485
2006-09-30	5108
2006-12-31	7237
2007-03-31	7716
2007-06-30	7205
2007-09-30	7147
2007-12-31	7466
2008-03-31	10160
2008-06-30	7654
2008-09-30	7690
2008-12-31	5694
2009-03-31	6833
2009-06-30	8614
2009-09-30	8481
2009-12-31	6073
2010-03-31	6895
2010-06-30	6048
2010-09-30	6354
2010-12-31	4856
2011-03-31	8154
2011-06-30	7387
2011-09-30	7788
2011-12-31	6662
2012-03-31	9606
2012-06-30	10122
2012-09-30	11054
2012-12-31	11901
2013-03-31	11538
2013-06-30	11903
2013-09-30	11201
2013-12-31	12770
2014-03-31	13955
2014-06-30	13279
2014-09-30	13347
2014-12-31	13399
2015-03-31	14621
2015-06-30	12170
2015-09-30	13747
2015-12-31	11246
2016-03-31	12067
2016-06-30	10115
2016-09-30	9815
2016-12-31	8606
2017-03-31	9061
2017-06-30	8214
2017-09-30	6359
2017-12-31	6520
2018-03-31	7986
2018-06-30	7670
2018-09-30	8308
2018-12-31	9332
2019-03-31	10498
2019-06-30	7679
2019-09-30	7228
2019-12-31	6641
2020-03-31	7550
2020-06-30	7853
2020-09-30	7174
2020-12-31	7630
2021-03-31	8300
2021-06-30	9009
2021-09-30	8023
2021-12-31	5338
2022-03-31	7169
2022-06-30	6086
2022-09-30	5292
2022-12-31	5018
2023-03-31	5730
2023-06-30	6710
2023-09-30	6141