Quarter	US dollars
2004-12-31	3698
2005-03-31	4011
2005-06-30	4076
2005-09-30	4921
2005-12-31	4398
2006-03-31	4749
2006-06-30	5831
2006-09-30	5741
2006-12-31	7840
2007-03-31	10511
2007-06-30	11557
2007-09-30	13669
2007-12-31	16019
2008-03-31	18235
2008-06-30	19001
2008-09-30	20633
2008-12-31	18147
2009-03-31	17809
2009-06-30	18650
2009-09-30	22265
2009-12-31	23182
2010-03-31	25446
2010-06-30	34027
2010-09-30	37678
2010-12-31	38312
2011-03-31	41912
2011-06-30	41945
2011-09-30	42246
2011-12-31	41977
2012-03-31	39857
2012-06-30	42042
2012-09-30	40624
2012-12-31	42973
2013-03-31	44344
2013-06-30	41849
2013-09-30	39421
2013-12-31	37975
2014-03-31	37176
2014-06-30	35933
2014-09-30	34679
2014-12-31	33278
2015-03-31	32166
2015-06-30	29676
2015-09-30	27499
2015-12-31	25431
2016-03-31	25783
2016-06-30	25341
2016-09-30	24958
2016-12-31	20448
2017-03-31	21732
2017-06-30	21370
2017-09-30	21888
2017-12-31	22486
2018-03-31	24088
2018-06-30	23940
2018-09-30	22810
2018-12-31	21230
2019-03-31	23174
2019-06-30	23838
2019-09-30	21116
2019-12-31	17563
2020-03-31	18471
2020-06-30	17724
2020-09-30	15241
2020-12-31	16117
2021-03-31	15047
2021-06-30	16168
2021-09-30	14657
2021-12-31	19943
2022-03-31	15643
2022-06-30	14732
2022-09-30	15161
2022-12-31	14657
2023-03-31	12535
2023-06-30	11663
2023-09-30	14597