Quarter	US dollars
2004-12-31	24431
2005-03-31	26021
2005-06-30	25742
2005-09-30	25108
2005-12-31	24783
2006-03-31	28154
2006-06-30	30232
2006-09-30	30231
2006-12-31	32128
2007-03-31	34001
2007-06-30	34943
2007-09-30	36143
2007-12-31	34970
2008-03-31	38015
2008-06-30	33873
2008-09-30	29914
2008-12-31	27613
2009-03-31	26621
2009-06-30	26164
2009-09-30	29485
2009-12-31	23043
2010-03-31	22415
2010-06-30	20016
2010-09-30	20330
2010-12-31	18041
2011-03-31	18289
2011-06-30	14413
2011-09-30	14613
2011-12-31	10006
2012-03-31	10792
2012-06-30	10613
2012-09-30	11716
2012-12-31	11675
2013-03-31	12201
2013-06-30	12052
2013-09-30	12141
2013-12-31	11723
2014-03-31	10227
2014-06-30	10407
2014-09-30	10158
2014-12-31	9576
2015-03-31	7976
2015-06-30	7517
2015-09-30	6825
2015-12-31	6307
2016-03-31	5888
2016-06-30	7910
2016-09-30	7615
2016-12-31	9417
2017-03-31	10232
2017-06-30	10554
2017-09-30	9532
2017-12-31	9013
2018-03-31	9496
2018-06-30	9105
2018-09-30	13006
2018-12-31	11380
2019-03-31	12276
2019-06-30	12111
2019-09-30	14846
2019-12-31	15065
2020-03-31	12649
2020-06-30	12186
2020-09-30	13494
2020-12-31	15651
2021-03-31	13284
2021-06-30	11095
2021-09-30	11123
2021-12-31	12946
2022-03-31	13669
2022-06-30	14178
2022-09-30	13412
2022-12-31	14934
2023-03-31	17024
2023-06-30	18519
2023-09-30	18265