Quarter	US dollars
2004-12-31	19861
2005-03-31	20371
2005-06-30	23270
2005-09-30	21868
2005-12-31	24329
2006-03-31	25015
2006-06-30	26324
2006-09-30	26136
2006-12-31	24535
2007-03-31	23928
2007-06-30	24984
2007-09-30	27271
2007-12-31	29658
2008-03-31	29733
2008-06-30	29995
2008-09-30	28280
2008-12-31	24370
2009-03-31	23384
2009-06-30	15007
2009-09-30	14154
2009-12-31	13853
2010-03-31	15100
2010-06-30	16693
2010-09-30	17362
2010-12-31	17199
2011-03-31	18552
2011-06-30	19301
2011-09-30	19277
2011-12-31	17064
2012-03-31	18158
2012-06-30	17595
2012-09-30	17580
2012-12-31	18381
2013-03-31	18544
2013-06-30	18067
2013-09-30	18435
2013-12-31	18445
2014-03-31	18430
2014-06-30	18964
2014-09-30	18924
2014-12-31	18566
2015-03-31	18614
2015-06-30	18309
2015-09-30	17661
2015-12-31	17684
2016-03-31	18059
2016-06-30	17690
2016-09-30	17094
2016-12-31	15910
2017-03-31	17233
2017-06-30	19099
2017-09-30	18695
2017-12-31	17776
2018-03-31	19194
2018-06-30	18603
2018-09-30	20859
2018-12-31	20479
2019-03-31	22086
2019-06-30	23567
2019-09-30	22631
2019-12-31	22701
2020-03-31	20221
2020-06-30	20475
2020-09-30	19918
2020-12-31	20528
2021-03-31	21068
2021-06-30	21983
2021-09-30	22481
2021-12-31	21055
2022-03-31	22204
2022-06-30	22760
2022-09-30	22894
2022-12-31	23459
2023-03-31	25525
2023-06-30	27124
2023-09-30	27469