Quarter	US dollars
2004-12-31	16463
2005-03-31	17777
2005-06-30	17317
2005-09-30	24250
2005-12-31	25906
2006-03-31	27958
2006-06-30	28066
2006-09-30	27860
2006-12-31	29672
2007-03-31	31881
2007-06-30	35790
2007-09-30	35080
2007-12-31	37517
2008-03-31	40678
2008-06-30	38057
2008-09-30	38568
2008-12-31	37020
2009-03-31	37193
2009-06-30	36674
2009-09-30	35653
2009-12-31	38978
2010-03-31	40320
2010-06-30	42164
2010-09-30	44054
2010-12-31	33273
2011-03-31	26191
2011-06-30	25535
2011-09-30	25076
2011-12-31	26356
2012-03-31	26139
2012-06-30	26773
2012-09-30	25721
2012-12-31	26790
2013-03-31	27954
2013-06-30	31309
2013-09-30	29734
2013-12-31	28638
2014-03-31	28666
2014-06-30	29730
2014-09-30	27423
2014-12-31	28018
2015-03-31	24931
2015-06-30	25075
2015-09-30	24356
2015-12-31	21695
2016-03-31	23786
2016-06-30	25389
2016-09-30	26750
2016-12-31	27250
2017-03-31	28945
2017-06-30	35391
2017-09-30	34040
2017-12-31	33112
2018-03-31	31223
2018-06-30	32726
2018-09-30	34544
2018-12-31	35088
2019-03-31	30579
2019-06-30	35594
2019-09-30	32440
2019-12-31	32778
2020-03-31	33473
2020-06-30	30733
2020-09-30	31298
2020-12-31	35707
2021-03-31	37184
2021-06-30	36220
2021-09-30	33705
2021-12-31	34070
2022-03-31	34960
2022-06-30	32734
2022-09-30	31027
2022-12-31	31936
2023-03-31	30465
2023-06-30	30777
2023-09-30	29266