Quarter	US dollars
2004-12-31	6652
2005-03-31	7403
2005-06-30	7453
2005-09-30	6976
2005-12-31	6820
2006-03-31	7696
2006-06-30	8897
2006-09-30	9270
2006-12-31	10523
2007-03-31	9924
2007-06-30	11727
2007-09-30	13565
2007-12-31	14802
2008-03-31	14908
2008-06-30	13895
2008-09-30	12836
2008-12-31	13889
2009-03-31	13958
2009-06-30	13688
2009-09-30	13261
2009-12-31	12660
2010-03-31	12718
2010-06-30	13114
2010-09-30	12054
2010-12-31	11888
2011-03-31	12651
2011-06-30	9741
2011-09-30	12057
2011-12-31	12848
2012-03-31	14450
2012-06-30	14781
2012-09-30	14760
2012-12-31	14142
2013-03-31	14096
2013-06-30	14374
2013-09-30	15054
2013-12-31	14637
2014-03-31	14887
2014-06-30	14797
2014-09-30	13368
2014-12-31	13758
2015-03-31	14250
2015-06-30	13779
2015-09-30	12695
2015-12-31	13304
2016-03-31	14198
2016-06-30	15459
2016-09-30	16088
2016-12-31	15820
2017-03-31	14139
2017-06-30	12755
2017-09-30	17492
2017-12-31	17685
2018-03-31	18133
2018-06-30	16653
2018-09-30	17262
2018-12-31	17380
2019-03-31	17744
2019-06-30	17596
2019-09-30	18671
2019-12-31	19070
2020-03-31	19133
2020-06-30	19237
2020-09-30	17304
2020-12-31	17776
2021-03-31	18089
2021-06-30	18772
2021-09-30	19192
2021-12-31	19062
2022-03-31	19642
2022-06-30	18304
2022-09-30	17769
2022-12-31	19645
2023-03-31	19179
2023-06-30	17336
2023-09-30	18347