Quarter	US dollars
2004-12-31	20000
2005-03-31	20401
2005-06-30	21284
2005-09-30	20097
2005-12-31	20591
2006-03-31	22047
2006-06-30	25433
2006-09-30	26945
2006-12-31	28345
2007-03-31	30936
2007-06-30	27221
2007-09-30	28291
2007-12-31	30092
2008-03-31	34104
2008-06-30	31123
2008-09-30	29663
2008-12-31	22698
2009-03-31	20708
2009-06-30	21991
2009-09-30	23174
2009-12-31	23053
2010-03-31	20491
2010-06-30	18065
2010-09-30	13500
2010-12-31	17053
2011-03-31	15766
2011-06-30	17299
2011-09-30	13211
2011-12-31	17251
2012-03-31	17563
2012-06-30	19208
2012-09-30	20267
2012-12-31	21641
2013-03-31	19977
2013-06-30	17243
2013-09-30	15422
2013-12-31	12626
2014-03-31	10594
2014-06-30	14267
2014-09-30	12508
2014-12-31	14729
2015-03-31	15873
2015-06-30	12962
2015-09-30	15783
2015-12-31	14884
2016-03-31	15107
2016-06-30	13514
2016-09-30	11027
2016-12-31	12227
2017-03-31	12768
2017-06-30	12412
2017-09-30	12769
2017-12-31	12955
2018-03-31	13382
2018-06-30	15329
2018-09-30	14802
2018-12-31	16283
2019-03-31	14816
2019-06-30	15312
2019-09-30	16083
2019-12-31	17332
2020-03-31	19512
2020-06-30	19657
2020-09-30	20800
2020-12-31	23067
2021-03-31	23484
2021-06-30	19800
2021-09-30	17664
2021-12-31	22058
2022-03-31	25272
2022-06-30	27568
2022-09-30	23675
2022-12-31	25836
2023-03-31	26965
2023-06-30	31585
2023-09-30	33108