Quarter	US dollars
2004-12-31	19821
2005-03-31	15558
2005-06-30	14532
2005-09-30	17309
2005-12-31	15238
2006-03-31	19796
2006-06-30	19446
2006-09-30	18820
2006-12-31	19445
2007-03-31	22845
2007-06-30	21888
2007-09-30	26390
2007-12-31	24371
2008-03-31	24693
2008-06-30	20442
2008-09-30	26498
2008-12-31	16425
2009-03-31	18198
2009-06-30	18737
2009-09-30	22520
2009-12-31	17238
2010-03-31	22565
2010-06-30	22584
2010-09-30	22793
2010-12-31	19033
2011-03-31	22181
2011-06-30	17674
2011-09-30	25046
2011-12-31	15917
2012-03-31	16393
2012-06-30	14618
2012-09-30	13840
2012-12-31	15470
2013-03-31	12720
2013-06-30	15909
2013-09-30	14876
2013-12-31	14254
2014-03-31	14062
2014-06-30	14719
2014-09-30	14173
2014-12-31	12991
2015-03-31	16017
2015-06-30	13359
2015-09-30	12587
2015-12-31	11706
2016-03-31	11810
2016-06-30	12122
2016-09-30	12305
2016-12-31	11116
2017-03-31	11769
2017-06-30	13008
2017-09-30	11388
2017-12-31	12805
2018-03-31	15568
2018-06-30	12740
2018-09-30	11524
2018-12-31	8922
2019-03-31	12450
2019-06-30	11059
2019-09-30	13139
2019-12-31	11440
2020-03-31	13003
2020-06-30	11797
2020-09-30	13891
2020-12-31	15560
2021-03-31	12387
2021-06-30	12671
2021-09-30	13319
2021-12-31	12507
2022-03-31	11138
2022-06-30	10947
2022-09-30	10591
2022-12-31	9818
2023-03-31	10671
2023-06-30	12930
2023-09-30	11689