Quarter	US dollars
2004-12-31	24181
2005-03-31	25405
2005-06-30	24828
2005-09-30	24086
2005-12-31	24841
2006-03-31	26375
2006-06-30	28521
2006-09-30	30108
2006-12-31	32324
2007-03-31	34399
2007-06-30	39039
2007-09-30	46891
2007-12-31	49064
2008-03-31	59514
2008-06-30	56863
2008-09-30	49981
2008-12-31	43408
2009-03-31	46954
2009-06-30	43749
2009-09-30	43694
2009-12-31	43759
2010-03-31	42816
2010-06-30	47403
2010-09-30	47471
2010-12-31	49243
2011-03-31	51694
2011-06-30	58346
2011-09-30	63595
2011-12-31	59196
2012-03-31	59347
2012-06-30	59864
2012-09-30	59840
2012-12-31	60900
2013-03-31	63098
2013-06-30	62796
2013-09-30	66292
2013-12-31	66008
2014-03-31	65628
2014-06-30	67443
2014-09-30	65148
2014-12-31	65597
2015-03-31	61967
2015-06-30	62543
2015-09-30	55803
2015-12-31	50591
2016-03-31	52539
2016-06-30	51238
2016-09-30	50801
2016-12-31	51312
2017-03-31	47758
2017-06-30	55076
2017-09-30	59654
2017-12-31	61585
2018-03-31	61244
2018-06-30	60191
2018-09-30	57761
2018-12-31	56812
2019-03-31	58195
2019-06-30	57517
2019-09-30	57459
2019-12-31	56246
2020-03-31	56633
2020-06-30	56089
2020-09-30	52703
2020-12-31	51772
2021-03-31	55987
2021-06-30	57061
2021-09-30	57528
2021-12-31	57097
2022-03-31	61070
2022-06-30	56778
2022-09-30	57951
2022-12-31	60095
2023-03-31	56782
2023-06-30	55271
2023-09-30	56768