Quarter	US dollars
2004-12-31	14129
2005-03-31	12617
2005-06-30	12503
2005-09-30	17237
2005-12-31	9894
2006-03-31	14183
2006-06-30	13798
2006-09-30	12762
2006-12-31	17777
2007-06-30	20481
2007-09-30	27623
2007-12-31	25237
2008-03-31	29298
2008-06-30	17672
2008-09-30	16483
2008-12-31	23492
2009-03-31	19039
2009-06-30	19915
2009-09-30	21922
2009-12-31	21023
2010-03-31	30695
2010-06-30	60367
2010-09-30	64158
2010-12-31	56832
2011-03-31	53922
2011-06-30	59515
2011-09-30	84842
2011-12-31	83888
2012-03-31	123538
2012-06-30	95489
2012-09-30	77097
2012-12-31	91702
2013-03-31	58325
2013-06-30	65013
2013-09-30	51066
2013-12-31	41070
2014-03-31	50944
2014-06-30	28078
2014-09-30	16274
2014-12-31	27665
2015-03-31	13808
2015-06-30	26401
2015-09-30	25176
2015-12-31	35074
2016-03-31	37383
2016-06-30	64448
2016-09-30	66530
2016-12-31	40520
2017-03-31	45545
2017-06-30	58886
2017-09-30	57975
2017-12-31	67111
2018-03-31	68383
2018-06-30	65562
2018-09-30	53279
2018-12-31	27986
2019-03-31	14577
2019-06-30	13787
2019-09-30	15393
2019-12-31	16276
2020-03-31	14858
2020-06-30	17191
2020-09-30	18870
2020-12-31	20572
2021-03-31	19372
2021-06-30	19217
2021-09-30	20763
2021-12-31	20314
2022-03-31	19461
2022-06-30	19577
2022-09-30	19592
2022-12-31	20351
2023-03-31	22271
2023-06-30	27517
2023-09-30	29188