Quarter	US dollars
2004-12-31	15346
2005-03-31	12804
2005-06-30	11678
2005-09-30	11380
2005-12-31	10478
2006-03-31	13517
2006-06-30	12654
2006-09-30	11570
2006-12-31	8190
2007-03-31	10764
2007-06-30	7652
2007-09-30	15829
2007-12-31	10408
2008-03-31	13916
2008-06-30	11182
2008-09-30	11202
2008-12-31	10022
2009-03-31	14728
2009-06-30	15776
2009-09-30	16410
2009-12-31	16222
2010-03-31	19855
2010-06-30	19977
2010-09-30	18583
2010-12-31	17837
2011-03-31	23869
2011-06-30	32417
2011-09-30	35445
2011-12-31	33860
2012-03-31	41621
2012-06-30	42346
2012-09-30	43116
2012-12-31	41665
2013-03-31	44421
2013-06-30	41900
2013-09-30	47343
2013-12-31	44146
2014-03-31	51660
2014-06-30	51353
2014-09-30	54150
2014-12-31	50768
2015-03-31	51720
2015-06-30	55314
2015-09-30	59400
2015-12-31	54035
2016-03-31	60790
2016-06-30	57582
2016-09-30	55967
2016-12-31	52391
2017-03-31	50418
2017-06-30	51725
2017-09-30	48047
2017-12-31	43906
2018-03-31	48004
2018-06-30	43867
2018-09-30	44680
2018-12-31	43847
2019-03-31	53121
2019-06-30	54851
2019-09-30	55413
2019-12-31	50857
2020-03-31	54485
2020-06-30	58608
2020-09-30	61565
2020-12-31	61359
2021-03-31	61053
2021-06-30	60345
2021-09-30	58806
2021-12-31	63675
2022-03-31	68608
2022-06-30	66875
2022-09-30	60310
2022-12-31	63416
2023-03-31	65770
2023-06-30	64469
2023-09-30	67945