Quarter	US dollars
2004-12-31	16912
2005-03-31	18770
2005-06-30	19070
2005-09-30	19508
2005-12-31	20491
2006-03-31	20731
2006-06-30	21575
2006-09-30	23891
2006-12-31	24459
2007-03-31	25589
2007-06-30	29536
2007-09-30	35573
2007-12-31	36643
2008-03-31	41473
2008-06-30	41683
2008-09-30	37513
2008-12-31	29209
2009-03-31	31201
2009-06-30	33013
2009-09-30	32130
2009-12-31	30747
2010-03-31	28773
2010-06-30	30780
2010-09-30	33730
2010-12-31	35495
2011-03-31	50395
2011-06-30	50732
2011-09-30	45872
2011-12-31	47581
2012-03-31	53500
2012-06-30	52718
2012-09-30	53545
2012-12-31	54412
2013-03-31	57152
2013-06-30	57307
2013-09-30	62410
2013-12-31	63601
2014-03-31	62907
2014-06-30	63414
2014-09-30	65208
2014-12-31	68761
2015-03-31	64322
2015-06-30	61908
2015-09-30	54841
2015-12-31	50161
2016-03-31	52287
2016-06-30	56750
2016-09-30	51004
2016-12-31	52793
2017-03-31	53551
2017-06-30	58854
2017-09-30	58938
2017-12-31	60032
2018-03-31	51330
2018-06-30	52254
2018-09-30	51032
2018-12-31	51126
2019-03-31	53139
2019-06-30	53897
2019-09-30	54469
2019-12-31	53921
2020-03-31	53519
2020-06-30	52884
2020-09-30	52588
2020-12-31	45975
2021-03-31	49123
2021-06-30	45402
2021-09-30	47001
2021-12-31	45353
2022-03-31	48903
2022-06-30	44421
2022-09-30	43167
2022-12-31	40711
2023-03-31	42204
2023-06-30	43638
2023-09-30	43614