Quarter	US dollars
2004-12-31	16252
2005-03-31	13416
2005-06-30	12207
2005-09-30	11777
2005-12-31	10713
2006-03-31	13703
2006-06-30	12829
2006-09-30	11727
2006-12-31	8325
2007-03-31	10893
2007-06-30	7805
2007-09-30	15967
2007-12-31	10552
2008-03-31	14123
2008-06-30	11300
2008-09-30	11397
2008-12-31	10493
2009-03-31	15033
2009-06-30	16847
2009-09-30	17549
2009-12-31	17277
2010-03-31	20410
2010-06-30	20387
2010-09-30	18982
2010-12-31	18312
2011-03-31	24797
2011-06-30	33510
2011-09-30	36732
2011-12-31	35209
2012-03-31	42677
2012-06-30	43510
2012-09-30	44051
2012-12-31	42651
2013-03-31	45344
2013-06-30	42700
2013-09-30	48119
2013-12-31	45088
2014-03-31	51668
2014-06-30	51356
2014-09-30	54155
2014-12-31	50770
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