Quarter	US dollars
2004-12-31	15196
2005-03-31	27944
2005-06-30	20947
2005-09-30	25411
2005-12-31	12746
2006-03-31	12313
2006-06-30	24989
2006-09-30	25923
2006-12-31	28099
2007-03-31	21523
2007-06-30	25965
2007-09-30	20470
2007-12-31	15045
2008-03-31	17083
2008-06-30	22192
2008-09-30	15356
2008-12-31	11676
2009-03-31	14759
2009-06-30	19083
2009-09-30	16548
2009-12-31	13703
2010-03-31	12822
2010-06-30	16814
2010-09-30	17145
2010-12-31	14099
2011-03-31	15706
2011-06-30	14816
2011-09-30	11729
2011-12-31	14714
2012-03-31	13122
2012-06-30	14160
2012-09-30	13392
2012-12-31	15431
2013-03-31	13554
2013-06-30	14594
2013-09-30	14228
2013-12-31	13743
2014-03-31	15883
2014-06-30	12424
2014-09-30	17180
2014-12-31	19485
2015-03-31	19758
2015-06-30	17838
2015-09-30	16286
2015-12-31	16799
2016-03-31	16505
2016-06-30	18936
2016-09-30	16496
2016-12-31	13124
2017-03-31	14831
2017-06-30	17864
2017-09-30	16064
2017-12-31	14123
2018-03-31	15000
2018-06-30	19497
2018-09-30	17145
2018-12-31	15971
2019-03-31	27910
2019-06-30	25429
2019-09-30	22535
2019-12-31	20939
2020-03-31	12237
2020-06-30	12657
2020-09-30	8482
2020-12-31	6341
2021-03-31	9802
2021-06-30	32962
2021-09-30	40351
2021-12-31	32431
2022-03-31	34544
2022-06-30	26404
2022-09-30	22263
2022-12-31	23975
2023-03-31	28617
2023-06-30	29033
2023-09-30	29681