Quarter	US dollars
2004-12-31	15981
2005-03-31	13327
2005-06-30	12101
2005-09-30	11801
2005-12-31	10825
2006-03-31	13517
2006-06-30	12650
2006-09-30	11534
2006-12-31	8153
2007-03-31	12027
2007-06-30	7598
2007-09-30	15774
2007-12-31	10361
2008-03-31	13853
2008-06-30	11212
2008-09-30	11234
2008-12-31	10019
2009-03-31	14725
2009-06-30	15773
2009-09-30	16418
2009-12-31	16221
2010-03-31	19825
2010-06-30	19952
2010-09-30	18555
2010-12-31	17811
2011-03-31	23845
2011-06-30	32391
2011-09-30	35422
2011-12-31	33839
2012-03-31	41602
2012-06-30	42330
2012-09-30	43094
2012-12-31	41646
2013-03-31	44403
2013-06-30	41885
2013-09-30	47335
2013-12-31	44141
2014-03-31	51658
2014-06-30	51353
2014-09-30	53905
2014-12-31	50698
2015-03-31	51712
2015-06-30	55284
2015-09-30	59234
2015-12-31	53780
2016-03-31	60570
2016-06-30	57402
2016-09-30	55881
2016-12-31	51965
2017-03-31	50203
2017-06-30	51260
2017-09-30	47506
2017-12-31	43135
2018-03-31	46967
2018-06-30	42902
2018-09-30	43563
2018-12-31	42809
2019-03-31	52594
2019-06-30	54351
2019-09-30	54841
2019-12-31	50240
2020-03-31	53867
2020-06-30	58069
2020-09-30	60868
2020-12-31	60546
2021-03-31	60209
2021-06-30	59605
2021-09-30	58082
2021-12-31	62932
2022-03-31	67817
2022-06-30	66210
2022-09-30	59496
2022-12-31	62731
2023-03-31	64344
2023-06-30	63253
2023-09-30	66880