Quarter	US dollars
2004-12-31	17588
2005-03-31	17658
2005-06-30	20399
2005-09-30	19471
2005-12-31	21883
2006-03-31	22143
2006-06-30	23214
2006-09-30	22990
2006-12-31	24930
2007-03-31	23891
2007-06-30	25481
2007-09-30	27216
2007-12-31	29266
2008-03-31	29759
2008-06-30	30381
2008-09-30	29515
2008-12-31	24548
2009-03-31	23620
2009-06-30	24957
2009-09-30	22763
2009-12-31	23377
2010-03-31	28226
2010-06-30	27564
2010-09-30	30147
2010-12-31	29680
2011-03-31	32921
2011-06-30	36221
2011-09-30	30951
2011-12-31	31877
2012-03-31	34910
2012-06-30	33460
2012-09-30	32505
2012-12-31	33363
2013-03-31	32554
2013-06-30	30103
2013-09-30	28798
2013-12-31	31554
2014-03-31	31592
2014-06-30	35160
2014-09-30	34596
2014-12-31	32174
2015-03-31	29920
2015-06-30	27435
2015-09-30	24187
2015-12-31	24638
2016-03-31	28698
2016-06-30	24629
2016-09-30	23060
2016-12-31	22470
2017-03-31	24547
2017-06-30	26558
2017-09-30	27133
2017-12-31	27900
2018-03-31	30356
2018-06-30	28975
2018-09-30	31014
2018-12-31	31594
2019-03-31	33595
2019-06-30	33756
2019-09-30	32503
2019-12-31	33401
2020-03-31	27463
2020-06-30	29287
2020-09-30	27425
2020-12-31	30482
2021-03-31	28795
2021-06-30	30663
2021-09-30	29705
2021-12-31	29233
2022-03-31	31287
2022-06-30	30915
2022-09-30	32007
2022-12-31	33893
2023-03-31	36142
2023-06-30	39100
2023-09-30	39597