Quarter	US dollars
2004-12-31	1517
2005-03-31	1647
2005-06-30	1810
2005-09-30	1921
2005-12-31	2087
2006-03-31	2244
2006-06-30	2600
2006-09-30	2903
2006-12-31	3076
2007-03-31	3313
2007-06-30	4111
2007-09-30	4352
2007-12-31	4669
2008-03-31	6253
2008-06-30	6731
2008-09-30	6663
2008-12-31	6672
2009-03-31	6955
2009-06-30	6813
2009-09-30	7342
2009-12-31	7843
2010-03-31	8308
2010-06-30	8497
2010-09-30	8379
2010-12-31	8761
2011-03-31	8094
2011-06-30	7858
2011-09-30	8277
2011-12-31	7853
2012-03-31	8053
2012-06-30	7983
2012-09-30	8060
2012-12-31	7772
2013-03-31	8501
2013-06-30	7227
2013-09-30	7854
2013-12-31	7983
2014-03-31	7968
2014-06-30	7588
2014-09-30	7655
2014-12-31	8675
2015-03-31	8424
2015-06-30	8286
2015-09-30	8626
2015-12-31	8668
2016-03-31	7940
2016-06-30	7949
2016-09-30	8535
2016-12-31	4119
2017-03-31	4536
2017-06-30	3457
2017-09-30	3786
2017-12-31	3848
2018-03-31	4711
2018-06-30	4710
2018-09-30	4157
2018-12-31	4786
2019-03-31	5482
2019-06-30	5169
2019-09-30	5342
2019-12-31	5719
2020-03-31	6385
2020-06-30	6376
2020-09-30	6607
2020-12-31	6760
2021-03-31	6226
2021-06-30	5970
2021-09-30	6693
2021-12-31	6717
2022-03-31	6257
2022-06-30	6153
2022-09-30	6598
2022-12-31	6706
2023-03-31	5937
2023-06-30	5495
2023-09-30	6109