Quarter	US dollars
2004-12-31	6384
2005-03-31	7161
2005-06-30	9513
2005-09-30	8805
2005-12-31	10638
2006-03-31	13614
2006-06-30	17080
2006-09-30	17086
2006-12-31	17024
2007-03-31	18850
2007-06-30	25895
2007-09-30	29465
2007-12-31	26696
2008-03-31	26833
2008-06-30	28086
2008-09-30	28335
2008-12-31	22008
2009-03-31	20339
2009-06-30	21191
2009-09-30	19718
2009-12-31	14565
2010-03-31	17685
2010-06-30	15353
2010-09-30	17880
2010-12-31	16125
2011-03-31	14850
2011-06-30	11570
2011-09-30	13256
2011-12-31	13961
2012-03-31	14586
2012-06-30	16190
2012-09-30	13618
2012-12-31	22370
2013-03-31	22811
2013-06-30	21913
2013-09-30	19716
2013-12-31	23733
2014-03-31	20094
2014-06-30	21915
2014-09-30	22055
2014-12-31	16953
2015-03-31	17952
2015-06-30	20589
2015-09-30	21135
2015-12-31	22474
2016-03-31	21646
2016-06-30	20497
2016-09-30	20561
2016-12-31	20945
2017-03-31	18963
2017-06-30	20525
2017-09-30	22477
2017-12-31	21507
2018-03-31	23118
2018-06-30	22942
2018-09-30	19865
2018-12-31	21780
2019-03-31	23406
2019-06-30	22341
2019-09-30	26522
2019-12-31	24833
2020-03-31	25311
2020-06-30	22100
2020-09-30	24385
2020-12-31	24449
2021-03-31	25925
2021-06-30	28663
2021-09-30	28219
2021-12-31	26641
2022-03-31	31298
2022-06-30	32365
2022-09-30	33487
2022-12-31	33782
2023-03-31	36390
2023-06-30	37116
2023-09-30	36871