Quarter	US dollars
2004-12-31	8161
2005-03-31	7422
2005-06-30	9541
2005-09-30	9226
2005-12-31	7383
2006-03-31	6204
2006-06-30	6819
2006-09-30	5274
2006-12-31	4977
2007-03-31	8685
2007-06-30	10451
2007-09-30	11589
2007-12-31	14221
2008-03-31	18037
2008-06-30	21394
2008-09-30	15893
2008-12-31	30303
2009-03-31	20725
2009-06-30	17003
2009-09-30	19659
2009-12-31	16309
2010-03-31	17563
2010-06-30	19599
2010-09-30	23292
2010-12-31	19815
2011-03-31	16556
2011-06-30	17265
2011-09-30	21915
2011-12-31	20793
2012-03-31	20844
2012-06-30	22655
2012-09-30	22788
2012-12-31	21292
2013-03-31	20204
2013-06-30	18302
2013-09-30	17698
2013-12-31	16774
2014-03-31	14984
2014-06-30	20005
2014-09-30	21009
2014-12-31	21197
2015-03-31	21570
2015-06-30	15164
2015-09-30	14885
2015-12-31	12138
2016-03-31	14333
2016-06-30	14761
2016-09-30	14506
2016-12-31	11586
2017-03-31	9158
2017-06-30	8964
2017-09-30	8672
2017-12-31	8182
2018-03-31	8131
2018-06-30	5741
2018-09-30	6686
2018-12-31	7633
2019-03-31	9199
2019-06-30	9467
2019-09-30	12606
2019-12-31	10280
2020-03-31	11871
2020-06-30	12146
2020-09-30	12132
2020-12-31	12573
2021-03-31	9624
2021-06-30	9002
2021-09-30	8190
2021-12-31	7682
2022-03-31	5877
2022-06-30	5787
2022-09-30	6043
2022-12-31	5840
2023-03-31	5537
2023-06-30	5484
2023-09-30	5227