Quarter	US dollars
2004-12-31	13585
2005-03-31	14469
2005-06-30	15439
2005-09-30	20150
2005-12-31	25157
2006-03-31	23931
2006-06-30	25368
2006-09-30	24318
2006-12-31	29351
2007-03-31	31193
2007-06-30	35214
2007-09-30	38817
2007-12-31	39898
2008-03-31	38921
2008-06-30	41273
2008-09-30	40144
2008-12-31	38155
2009-03-31	36170
2009-06-30	33142
2009-09-30	32447
2009-12-31	33841
2010-03-31	26142
2010-06-30	23758
2010-09-30	24345
2010-12-31	23904
2011-03-31	18544
2011-06-30	18498
2011-09-30	18011
2011-12-31	18538
2012-03-31	18738
2012-06-30	17791
2012-09-30	19114
2012-12-31	20925
2013-03-31	22305
2013-06-30	18084
2013-09-30	17407
2013-12-31	17814
2014-03-31	22712
2014-06-30	22329
2014-09-30	20312
2014-12-31	24072
2015-03-31	24787
2015-06-30	23781
2015-09-30	25120
2015-12-31	24734
2016-03-31	19465
2016-06-30	19071
2016-09-30	19056
2016-12-31	20343
2017-03-31	22306
2017-06-30	17036
2017-09-30	17446
2017-12-31	21471
2018-03-31	20045
2018-06-30	20948
2018-09-30	21376
2018-12-31	22968
2019-03-31	20826
2019-06-30	21521
2019-09-30	22799
2019-12-31	23271
2020-03-31	23246
2020-06-30	19734
2020-09-30	18773
2020-12-31	18990
2021-03-31	21060
2021-06-30	23911
2021-09-30	22917
2021-12-31	21416
2022-03-31	26099
2022-06-30	24007
2022-09-30	21265
2022-12-31	25355
2023-03-31	24202
2023-06-30	25251
2023-09-30	25372