Quarter	US dollars
2004-12-31	17485
2005-03-31	19068
2005-06-30	25215
2005-09-30	31621
2005-12-31	16363
2006-03-31	18403
2006-06-30	17281
2006-09-30	19457
2006-12-31	18132
2007-03-31	18556
2007-06-30	22411
2007-09-30	19009
2007-12-31	21701
2008-03-31	29822
2008-06-30	30435
2008-09-30	21020
2008-12-31	18843
2009-03-31	20409
2009-06-30	21886
2009-09-30	20044
2009-12-31	21067
2010-03-31	27182
2010-06-30	30844
2010-09-30	29276
2010-12-31	21674
2011-03-31	17389
2011-06-30	19057
2011-09-30	18520
2011-12-31	13136
2012-03-31	14658
2012-06-30	12500
2012-09-30	17769
2012-12-31	19193
2013-03-31	23086
2013-06-30	23930
2013-09-30	31478
2013-12-31	28309
2014-03-31	22462
2014-06-30	23592
2014-09-30	17898
2014-12-31	12271
2015-03-31	14780
2015-06-30	13066
2015-09-30	10818
2015-12-31	8564
2016-03-31	9474
2016-06-30	8262
2016-09-30	7878
2016-12-31	6585
2017-03-31	9648
2017-06-30	11308
2017-09-30	11841
2017-12-31	12495
2018-03-31	9813
2018-06-30	11967
2018-09-30	13736
2018-12-31	11132
2019-03-31	9276
2019-06-30	7599
2019-09-30	7927
2019-12-31	6569
2020-03-31	7506
2020-06-30	8431
2020-09-30	10971
2020-12-31	13435
2021-03-31	11943
2021-06-30	13165
2021-09-30	12401
2021-12-31	14354
2022-03-31	14243
2022-06-30	11443
2022-09-30	14447
2022-12-31	13841
2023-03-31	25188
2023-06-30	29447
2023-09-30	24232