Quarter	US dollars
2004-12-31	8655
2005-03-31	7938
2005-06-30	10217
2005-09-30	9175
2005-12-31	9623
2006-03-31	10645
2006-06-30	12175
2006-09-30	11622
2006-12-31	11268
2007-03-31	12617
2007-06-30	12510
2007-09-30	14875
2007-12-31	17874
2008-03-31	20092
2008-06-30	20090
2008-09-30	20776
2008-12-31	15342
2009-03-31	14522
2009-06-30	14596
2009-09-30	17463
2009-12-31	20878
2010-03-31	22793
2010-06-30	40285
2010-09-30	44416
2010-12-31	49604
2011-03-31	54943
2011-06-30	59550
2011-09-30	53822
2011-12-31	52179
2012-03-31	52784
2012-06-30	53201
2012-09-30	50194
2012-12-31	42001
2013-03-31	39340
2013-06-30	47335
2013-09-30	51447
2013-12-31	41541
2014-03-31	44665
2014-06-30	42833
2014-09-30	45672
2014-12-31	45642
2015-03-31	44082
2015-06-30	44534
2015-09-30	40341
2015-12-31	34715
2016-03-31	36153
2016-06-30	34885
2016-09-30	30386
2016-12-31	26447
2017-03-31	26711
2017-06-30	41526
2017-09-30	40852
2017-12-31	40122
2018-03-31	37923
2018-06-30	37267
2018-09-30	35309
2018-12-31	37283
2019-03-31	38462
2019-06-30	38827
2019-09-30	35912
2019-12-31	38493
2020-03-31	40234
2020-06-30	37296
2020-09-30	35456
2020-12-31	35081
2021-03-31	40304
2021-06-30	44901
2021-09-30	37321
2021-12-31	38083
2022-03-31	45161
2022-06-30	41961
2022-09-30	39426
2022-12-31	35939
2023-03-31	41125
2023-06-30	45807
2023-09-30	40848